Protein acylation has been observed as a mechanism controlling biological signaling. Often such reactions require the presence of a dehydrating agent, i.e. A Claisen condensation contains two ester compounds. CH 3 COCH 2 CO 2 C 2 H 5 C 2 H 5 OH CH 3 COCH 2 CO 2 C 2 H 5 C 2 H 5 OH The overall reaction is as follows (where the Rs can be H): Transposition de Claisen La raction de Mukaiyama constitue un type particulier de condensation aldolique entre un ther d'nol silyl et un aldhyde en prsence d'un acide de Lewis comme TiCl 4. Caprolactam is the feedstock in the production of Nylon 6.. Deprotonation requires relatively strong bases, such as alkoxides. El trmino condensacin hace referencia a varios artculos, en esta enciclopedia: . As for aldehydes, the hydrogen atoms on the carbon adjacent (" to") the carboxyl group in esters are sufficiently acidic to undergo deprotonation, which in turn leads to a variety of useful reactions. Barfoed's test is a chemical test used for detecting the presence of monosaccharides.It is based on the reduction of copper(II) acetate to copper(I) oxide (Cu 2 O), which forms a brick-red precipitate.. RCHO + 2Cu 2+ + 2H 2 O RCOOH + Cu 2 O + 4H + (Disaccharides may also react, but the reaction is much slower. Common examples are the aldol Condensation, Knoevenagel condensation, Claisen condensation and the Dieckman condensation (intramolecular Claisen condensation) Condensation Reaction among two symmetrical aldehydes. Often such reactions require the presence of a dehydrating agent, i.e. )The aldehyde group of the monosaccharide which normally In organic chemistry, the Schmidt reaction is an organic reaction in which an azide reacts with a carbonyl derivative, usually an aldehyde, ketone, or carboxylic acid, under acidic conditions to give an amine or amide, with expulsion of nitrogen. [page needed] An a la condensacin, el cambio de estado cuando la materia, en forma gaseosa, pasa a forma lquida;; a la condensacin intersticial, en el interior de un material;; en meteorologa, al punto de condensacin, tambin punto de roco;; Qumica. wittig [3] Protein acylation is the post-translational modification of proteins via the attachment of functional groups through acyl linkages. A Henry reaction contains an aliphatic nitro compound and an aldehyde. A newer definition, proposed by Kohler, is the 1,4-addition of a doubly stabilized carbon nucleophile to an ,-unsaturated carbonyl compound. The benzoin condensation was first reported in 1832 by Justus von Liebig and Friedrich Whler during their research on bitter Dieckmann condensation contains 2 ester groups present in the same molecule, which produces cyclic molecule. ClaisenClaisenDieckmann In organic chemistry, umpolung (German: [mpol]) or polarity inversion is the chemical modification of a functional group with the aim of the reversal of polarity of that group. condensation. In this type of reaction, a nucleophile such as an alcohol, amine, or enolate displaces the leaving group of an acyl derivative such as an acid halide, anhydride, or ester.The resulting product is a carbonyl-containing compound in which the nucleophile has The archetypal Beckmann rearrangement is the conversion of cyclohexanone to caprolactam via the oxime. The desired enantiomer is obtained by chiral resolution with the chiral dibenzoyl ester of Tartaric acid. 400+ free articles on undergraduate organic chemistry topics plus free (and paid) study guides, a reaction encyclopedia, practice problems, tutoring & more. Protein acylation is the post-translational modification of proteins via the attachment of functional groups through acyl linkages. It is named after Karl Friedrich Schmidt (18871971), who first reported it in 1924 by successfully converting benzophenone and La condensation de Claisen ( ne pas confondre avec le rarrangement de Claisen) est une raction omniprsente en milieu biologique.C'est une raction formant une liaison carbone-carbone partir de deux esters (ou deux thioesters par exemple) ou encore entre un ester et un compos carbonyl en prsence d'une base forte, formant un -ctoester ou une -dictone [1] : Q 5. You can notice that these kinds of molecules or the beta-keto acids can be obtained through Claisen condensation. It is named after Karl Friedrich Schmidt (18871971), who first reported it in 1924 by successfully converting benzophenone and 6. In organic chemistry, the ClaisenSchmidt condensation is the reaction between an aldehyde or ketone having an -hydrogen with an aromatic carbonyl compound lacking an -hydrogen.This reaction is named after two of its pioneering investigators Rainer Ludwig Claisen and J. G. Schmidt, who independently published on this topic in 1880 and 1881. Ethyl acetate (systematically ethyl ethanoate, commonly abbreviated EtOAc, ETAC or EA) is the organic compound with the formula CH 3 CO 2 CH 2 CH 3, simplified to C 4 H 8 O 2.This colorless liquid has a characteristic sweet smell (similar to pear drops) and is used in glues, nail polish removers, and in the decaffeination process of tea and coffee. A typical modern aldol addition reaction, shown above, might involve the nucleophilic addition of a ketone enolate to an aldehyde.Once formed, the aldol product can sometimes lose a molecule of water to form an ,-unsaturated carbonyl compound.This is called aldol condensation.A variety of nucleophiles may be employed in the aldol reaction, including the enols, enolates, and enol The benzoin addition is an addition reaction involving two aldehydes.The reaction generally occurs between aromatic aldehydes or glyoxals, and results in formation of an acyloin.In the classic example, benzaldehyde is converted to benzoin.. s-cis(cisoid)s-trans(transoid)Diels-AlderZ-1,3-pentadienes-cisE The reaction proceeds when a strong base is present and the product of the reaction is a beta-keto ester or a beta-diketone. -. In organic chemistry, umpolung (German: [mpol]) or polarity inversion is the chemical modification of a functional group with the aim of the reversal of polarity of that group. Barfoed's test is a chemical test used for detecting the presence of monosaccharides.It is based on the reduction of copper(II) acetate to copper(I) oxide (Cu 2 O), which forms a brick-red precipitate.. RCHO + 2Cu 2+ + 2H 2 O RCOOH + Cu 2 O + 4H + (Disaccharides may also react, but the reaction is much slower. The reaction proceeds when a strong base is present and the product of the reaction is a beta-keto ester or a beta-diketone. The BischlerNapieralski reaction is an intramolecular electrophilic aromatic substitution reaction that allows for the cyclization of -arylethylamides or -arylethylcarbamates. The benzoin condensation was first reported in 1832 by Justus von Liebig and Friedrich Whler during their research on bitter An aldol condensation is a condensation reaction in organic chemistry in which two carbonyl moieties (of aldehydes or ketones) react to form a -hydroxyaldehyde or -hydroxyketone (an aldol reaction), and this is then followed by dehydration to give a conjugated enone. One prominent type is fatty acylation, the addition of fatty acids to particular amino acids (e.g. Dieckmann condensation contains 2 ester groups present in the same molecule, which produces cyclic molecule. a substance that reacts with water. The archetypal Beckmann rearrangement is the conversion of cyclohexanone to caprolactam via the oxime. A newer definition, proposed by Kohler, is the 1,4-addition of a doubly stabilized carbon nucleophile to an ,-unsaturated carbonyl compound. Ethyl acetate is the ester of As for aldehydes, the hydrogen atoms on the carbon adjacent (" to") the carboxyl group in esters are sufficiently acidic to undergo deprotonation, which in turn leads to a variety of useful reactions. wittig [3] -. ChemTube3D contains interactive 3D chemistry animations and structures, with supporting information, for students studying some of the most important topics in advanced school chemistry and university chemistry courses. A Claisen condensation contains two ester compounds. ClaisenClaisenDieckmann In organic chemistry, the Schmidt reaction is an organic reaction in which an azide reacts with a carbonyl derivative, usually an aldehyde, ketone, or carboxylic acid, under acidic conditions to give an amine or amide, with expulsion of nitrogen. The BischlerNapieralski reaction is an intramolecular electrophilic aromatic substitution reaction that allows for the cyclization of -arylethylamides or -arylethylcarbamates. Transposition de Claisen La raction de Mukaiyama constitue un type particulier de condensation aldolique entre un ther d'nol silyl et un aldhyde en prsence d'un acide de Lewis comme TiCl 4. The final product is produced irreversibly due to solidity from the conjugation of the double bonds. You can notice that these kinds of molecules or the beta-keto acids can be obtained through Claisen condensation. Fsica. Claisen condensation and related reactions. Ethyl acetate is the ester of Stobbe condensation; The Claisen condensation is a carboncarbon bond forming reaction that occurs between two esters or one ester and another carbonyl compound in the presence of a strong base, resulting in a -keto ester or a -diketone. The final step is a claisen condensation of 15 with ethyl quininate 16, which after acidic workup yields racemic quinotoxine 17. Definition. The classic example of a dehydration reaction is the Fischer esterification, which involves treating a carboxylic acid with an alcohol to give an ester . Dehydration reactions in organic chemistry Esterification. Dehydration reactions in organic chemistry Esterification. Definition. Stobbe condensation; The Claisen condensation is a carboncarbon bond forming reaction that occurs between two esters or one ester and another carbonyl compound in the presence of a strong base, resulting in a -keto ester or a -diketone. 6. The Claisen condensation reaction is an organic coupling reaction that results in the formation of a C-C bond between either a single ester and one carbonyl compound or between two esters. Clemmensen reduction is a chemical reaction described as a reduction of ketones (or aldehydes) to alkanes using zinc amalgam and concentrated hydrochloric acid. The benzoin condensation was first reported in 1832 by Justus von Liebig and Friedrich Whler during their research on bitter Click Start Quiz to begin! The Claisen condensation reaction is an organic coupling reaction that results in the formation of a C-C bond between either a single ester and one carbonyl compound or between two esters. The final product is produced irreversibly due to solidity from the conjugation of the double bonds. Ethyl acetate is the ester of A typical modern aldol addition reaction, shown above, might involve the nucleophilic addition of a ketone enolate to an aldehyde.Once formed, the aldol product can sometimes lose a molecule of water to form an ,-unsaturated carbonyl compound.This is called aldol condensation.A variety of nucleophiles may be employed in the aldol reaction, including the enols, enolates, and enol Often such reactions require the presence of a dehydrating agent, i.e. Common examples are the aldol Condensation, Knoevenagel condensation, Claisen condensation and the Dieckman condensation (intramolecular Claisen condensation) Condensation Reaction among two symmetrical aldehydes. ClaisenClaisenDieckmann )The aldehyde group of the monosaccharide which normally The classic example of a dehydration reaction is the Fischer esterification, which involves treating a carboxylic acid with an alcohol to give an ester . The introduction of fluorine into a drug molecule can alter the biological responses to it, including modulating bioavailability, pharmacokinetics and selectivity. A newer definition, proposed by Kohler, is the 1,4-addition of a doubly stabilized carbon nucleophile to an ,-unsaturated carbonyl compound. The conversion of this compound to quinine is based on the RabeKindler chemistry discussed in the timelime. Barfoed's test is a chemical test used for detecting the presence of monosaccharides.It is based on the reduction of copper(II) acetate to copper(I) oxide (Cu 2 O), which forms a brick-red precipitate.. RCHO + 2Cu 2+ + 2H 2 O RCOOH + Cu 2 O + 4H + (Disaccharides may also react, but the reaction is much slower. The Claisen condensation is a carboncarbon bond forming reaction that occurs between two esters or one ester and another carbonyl compound in the presence of a strong base, resulting in a -keto ester or a -diketone. Click Start Quiz to begin! Phenol formaldehyde resins (PF) or phenolic resins (also infrequently called phenoplasts) are synthetic polymers obtained by the reaction of phenol or substituted phenol with formaldehyde.Used as the basis for Bakelite, PFs were the first commercial synthetic resins (plastics).They have been widely used for the production of molded products including billiard In this type of reaction, a nucleophile such as an alcohol, amine, or enolate displaces the leaving group of an acyl derivative such as an acid halide, anhydride, or ester.The resulting product is a carbonyl-containing compound in which the nucleophile has One prominent type is fatty acylation, the addition of fatty acids to particular amino acids (e.g. . Deprotonation requires relatively strong bases, such as alkoxides. Caprolactam is the feedstock in the production of Nylon 6.. Phenol formaldehyde resins (PF) or phenolic resins (also infrequently called phenoplasts) are synthetic polymers obtained by the reaction of phenol or substituted phenol with formaldehyde.Used as the basis for Bakelite, PFs were the first commercial synthetic resins (plastics).They have been widely used for the production of molded products including billiard Fsica. This modification allows secondary reactions of this functional group that would otherwise not be possible. Transposition de Claisen La raction de Mukaiyama constitue un type particulier de condensation aldolique entre un ther d'nol silyl et un aldhyde en prsence d'un acide de Lewis comme TiCl 4. This reaction is named after Erik Christian Clemmensen, a Danish chemist. The CBS catalyst or CoreyBakshiShibata catalyst is an asymmetric catalyst derived from proline.It finds many uses in organic reactions such as the CBS reduction, Diels-Alder reactions and (3+2) cycloadditions.Proline, a naturally occurring chiral compound, is readily and cheaply available. Put your understanding of this concept to test by answering a few MCQs. El trmino condensacin hace referencia a varios artculos, en esta enciclopedia: . It is named after Rainer Ludwig Claisen, who first published his work on the reaction in 1887. RCO 2 H + ROH RCO 2 R + H 2 O. The classic example of a dehydration reaction is the Fischer esterification, which involves treating a carboxylic acid with an alcohol to give an ester . Acetoacetyl CoA is the precursor of HMG-CoA in the mevalonate pathway, which is essential for cholesterol biosynthesis.It also takes a similar role in the ketone bodies synthesis (ketogenesis) pathway of the liver.In the ketone bodies digestion pathway (in the tissue), it is no longer associated with having HMG-CoA as a product or as a reactant.. The overall reaction is as follows (where the Rs can be H): In this type of reaction, a nucleophile such as an alcohol, amine, or enolate displaces the leaving group of an acyl derivative such as an acid halide, anhydride, or ester.The resulting product is a carbonyl-containing compound in which the nucleophile has The final step is a claisen condensation of 15 with ethyl quininate 16, which after acidic workup yields racemic quinotoxine 17. Some examples of nucleophiles include beta-ketoesters, The benzoin addition is an addition reaction involving two aldehydes.The reaction generally occurs between aromatic aldehydes or glyoxals, and results in formation of an acyloin.In the classic example, benzaldehyde is converted to benzoin.. Q 5. The overall reaction is as follows (where the Rs can be H): The introduction of fluorine into a drug molecule can alter the biological responses to it, including modulating bioavailability, pharmacokinetics and selectivity. As for aldehydes, the hydrogen atoms on the carbon adjacent (" to") the carboxyl group in esters are sufficiently acidic to undergo deprotonation, which in turn leads to a variety of useful reactions. The conversion of this compound to quinine is based on the RabeKindler chemistry discussed in the timelime. It is named after Karl Friedrich Schmidt (18871971), who first reported it in 1924 by successfully converting benzophenone and It was first discovered in 1893 by August Bischler and Bernard Napieralski [], in affiliation with Basle Chemical Works and the University of Zurich.The reaction is most notably used in the synthesis Some examples of nucleophiles include beta-ketoesters, Pericyclic Reaction La condensation de Claisen ( ne pas confondre avec le rarrangement de Claisen) est une raction omniprsente en milieu biologique.C'est une raction formant une liaison carbone-carbone partir de deux esters (ou deux thioesters par exemple) ou encore entre un ester et un compos carbonyl en prsence d'une base forte, formant un -ctoester ou une -dictone [1] : The CBS catalyst or CoreyBakshiShibata catalyst is an asymmetric catalyst derived from proline.It finds many uses in organic reactions such as the CBS reduction, Diels-Alder reactions and (3+2) cycloadditions.Proline, a naturally occurring chiral compound, is readily and cheaply available. Claisen condensation and related reactions. The reaction proceeds when a strong base is present and the product of the reaction is a beta-keto ester or a beta-diketone. The Claisen condensation reaction is an organic coupling reaction that results in the formation of a C-C bond between either a single ester and one carbonyl compound or between two esters. a la condensacin, el cambio de estado cuando la materia, en forma gaseosa, pasa a forma lquida;; a la condensacin intersticial, en el interior de un material;; en meteorologa, al punto de condensacin, tambin punto de roco;; Qumica. a substance that reacts with water. The final product is produced irreversibly due to solidity from the conjugation of the double bonds. Nucleophilic acyl substitution describe a class of substitution reactions involving nucleophiles and acyl compounds. It transfers its stereocenter to the catalyst which in turn is able to drive an organic In organic chemistry, the ClaisenSchmidt condensation is the reaction between an aldehyde or ketone having an -hydrogen with an aromatic carbonyl compound lacking an -hydrogen.This reaction is named after two of its pioneering investigators Rainer Ludwig Claisen and J. G. Schmidt, who independently published on this topic in 1880 and 1881. A Claisen condensation contains two ester compounds. Acetoacetyl CoA is the precursor of HMG-CoA in the mevalonate pathway, which is essential for cholesterol biosynthesis.It also takes a similar role in the ketone bodies synthesis (ketogenesis) pathway of the liver.In the ketone bodies digestion pathway (in the tissue), it is no longer associated with having HMG-CoA as a product or as a reactant.. The concept was introduced by D. Seebach (hence the German word umpolung for myristoylation, palmitoylation or palmitoleoylation). . Claisen condensation and related reactions. )The aldehyde group of the monosaccharide which normally Pericyclic Reaction s-cis(cisoid)s-trans(transoid)Diels-AlderZ-1,3-pentadienes-cisE The introduction of fluorine into a drug molecule can alter the biological responses to it, including modulating bioavailability, pharmacokinetics and selectivity. Put your understanding of this concept to test by answering a few MCQs. It is named after Rainer Ludwig Claisen, who first published his work on the reaction in 1887. A Henry reaction contains an aliphatic nitro compound and an aldehyde. In JappMaitland condensation, water is removed by nucleophilic displacement. It is named after Rainer Ludwig Claisen, who first published his work on the reaction in 1887. condensation. The benzoin addition is an addition reaction involving two aldehydes.The reaction generally occurs between aromatic aldehydes or glyoxals, and results in formation of an acyloin.In the classic example, benzaldehyde is converted to benzoin.. As originally defined by Arthur Michael, the reaction is the addition of an enolate of a ketone or aldehyde to an ,-unsaturated carbonyl compound at the carbon. It is named after Rainer Ludwig Claisen, who first published his work on the reaction in 1887. In organic chemistry, the ClaisenSchmidt condensation is the reaction between an aldehyde or ketone having an -hydrogen with an aromatic carbonyl compound lacking an -hydrogen.This reaction is named after two of its pioneering investigators Rainer Ludwig Claisen and J. G. Schmidt, who independently published on this topic in 1880 and 1881. Clemmensen reduction is a chemical reaction described as a reduction of ketones (or aldehydes) to alkanes using zinc amalgam and concentrated hydrochloric acid. It is named after Rainer Ludwig Claisen, who first published his work on the reaction in 1887. Some examples of nucleophiles include beta-ketoesters, It transfers its stereocenter to the catalyst which in turn is able to drive an organic RCO 2 H + ROH RCO 2 R + H 2 O. Stobbe condensation; The Claisen condensation is a carboncarbon bond forming reaction that occurs between two esters or one ester and another carbonyl compound in the presence of a strong base, resulting in a -keto ester or a -diketone. myristoylation, palmitoylation or palmitoleoylation). . Ethyl acetate (systematically ethyl ethanoate, commonly abbreviated EtOAc, ETAC or EA) is the organic compound with the formula CH 3 CO 2 CH 2 CH 3, simplified to C 4 H 8 O 2.This colorless liquid has a characteristic sweet smell (similar to pear drops) and is used in glues, nail polish removers, and in the decaffeination process of tea and coffee. The desired enantiomer is obtained by chiral resolution with the chiral dibenzoyl ester of Tartaric acid. One prominent type is fatty acylation, the addition of fatty acids to particular amino acids (e.g. El trmino condensacin hace referencia a varios artculos, en esta enciclopedia: . The concept was introduced by D. Seebach (hence the German word umpolung for As originally defined by Arthur Michael, the reaction is the addition of an enolate of a ketone or aldehyde to an ,-unsaturated carbonyl compound at the carbon. This reaction is named after Erik Christian Clemmensen, a Danish chemist. The Claisen condensation is a carboncarbon bond forming reaction that occurs between two esters or one ester and another carbonyl compound in the presence of a strong base, resulting in a -keto ester or a -diketone. As originally defined by Arthur Michael, the reaction is the addition of an enolate of a ketone or aldehyde to an ,-unsaturated carbonyl compound at the carbon. Protein acylation is the post-translational modification of proteins via the attachment of functional groups through acyl linkages. It is created from acetyl-CoA, A Henry reaction contains an aliphatic nitro compound and an aldehyde. The Claisen condensation is a carboncarbon bond forming reaction that occurs between two esters or one ester and another carbonyl compound in the presence of a strong base, resulting in a -keto ester or a -diketone. Phenol formaldehyde resins (PF) or phenolic resins (also infrequently called phenoplasts) are synthetic polymers obtained by the reaction of phenol or substituted phenol with formaldehyde.Used as the basis for Bakelite, PFs were the first commercial synthetic resins (plastics).They have been widely used for the production of molded products including billiard Deprotonation requires relatively strong bases, such as alkoxides. [page needed] An Ethyl acetate (systematically ethyl ethanoate, commonly abbreviated EtOAc, ETAC or EA) is the organic compound with the formula CH 3 CO 2 CH 2 CH 3, simplified to C 4 H 8 O 2.This colorless liquid has a characteristic sweet smell (similar to pear drops) and is used in glues, nail polish removers, and in the decaffeination process of tea and coffee. ChemTube3D contains interactive 3D chemistry animations and structures, with supporting information, for students studying some of the most important topics in advanced school chemistry and university chemistry courses. In organic chemistry, the Schmidt reaction is an organic reaction in which an azide reacts with a carbonyl derivative, usually an aldehyde, ketone, or carboxylic acid, under acidic conditions to give an amine or amide, with expulsion of nitrogen. Protein acylation has been observed as a mechanism controlling biological signaling. La condensation de Claisen ( ne pas confondre avec le rarrangement de Claisen) est une raction omniprsente en milieu biologique.C'est une raction formant une liaison carbone-carbone partir de deux esters (ou deux thioesters par exemple) ou encore entre un ester et un compos carbonyl en prsence d'une base forte, formant un -ctoester ou une -dictone [1] : condensation. The Beckmann solution consists of acetic acid, hydrochloric acid and acetic anhydride, and was widely used to catalyze the rearrangement.Other acids, such as sulfuric acid, polyphosphoric acid, and hydrogen Definition. Common examples are the aldol Condensation, Knoevenagel condensation, Claisen condensation and the Dieckman condensation (intramolecular Claisen condensation) Condensation Reaction among two symmetrical aldehydes. 6. Put your understanding of this concept to test by answering a few MCQs. An aldol condensation is a condensation reaction in organic chemistry in which two carbonyl moieties (of aldehydes or ketones) react to form a -hydroxyaldehyde or -hydroxyketone (an aldol reaction), and this is then followed by dehydration to give a conjugated enone. The archetypal Beckmann rearrangement is the conversion of cyclohexanone to caprolactam via the oxime. This modification allows secondary reactions of this functional group that would otherwise not be possible. In organic chemistry, umpolung (German: [mpol]) or polarity inversion is the chemical modification of a functional group with the aim of the reversal of polarity of that group. Test your knowledge on Decarboxylation Reaction. The final step is a claisen condensation of 15 with ethyl quininate 16, which after acidic workup yields racemic quinotoxine 17. Dieckmann condensation contains 2 ester groups present in the same molecule, which produces cyclic molecule. In JappMaitland condensation, water is removed by nucleophilic displacement. a substance that reacts with water. 400+ free articles on undergraduate organic chemistry topics plus free (and paid) study guides, a reaction encyclopedia, practice problems, tutoring & more. s-cis(cisoid)s-trans(transoid)Diels-AlderZ-1,3-pentadienes-cisE It was first discovered in 1893 by August Bischler and Bernard Napieralski [], in affiliation with Basle Chemical Works and the University of Zurich.The reaction is most notably used in the synthesis Acetoacetyl CoA is the precursor of HMG-CoA in the mevalonate pathway, which is essential for cholesterol biosynthesis.It also takes a similar role in the ketone bodies synthesis (ketogenesis) pathway of the liver.In the ketone bodies digestion pathway (in the tissue), it is no longer associated with having HMG-CoA as a product or as a reactant.. 400+ free articles on undergraduate organic chemistry topics plus free (and paid) study guides, a reaction encyclopedia, practice problems, tutoring & more. Nucleophilic acyl substitution describe a class of substitution reactions involving nucleophiles and acyl compounds. Test your knowledge on Decarboxylation Reaction. The BischlerNapieralski reaction is an intramolecular electrophilic aromatic substitution reaction that allows for the cyclization of -arylethylamides or -arylethylcarbamates. myristoylation, palmitoylation or palmitoleoylation). wittig [3] This reaction is named after Erik Christian Clemmensen, a Danish chemist. This modification allows secondary reactions of this functional group that would otherwise not be possible. Clemmensen reduction is a chemical reaction described as a reduction of ketones (or aldehydes) to alkanes using zinc amalgam and concentrated hydrochloric acid. It transfers its stereocenter to the catalyst which in turn is able to drive an organic Q 5. a la condensacin, el cambio de estado cuando la materia, en forma gaseosa, pasa a forma lquida;; a la condensacin intersticial, en el interior de un material;; en meteorologa, al punto de condensacin, tambin punto de roco;; Qumica. The Beckmann solution consists of acetic acid, hydrochloric acid and acetic anhydride, and was widely used to catalyze the rearrangement.Other acids, such as sulfuric acid, polyphosphoric acid, and hydrogen