19759-28-5Relevant academic research and scientific papers
Asymmetric transesterification of secondary alcohols catalyzed by feruloyl esterase from Humicola insolens
Hatzakis, Nikos S.,Smonou, Ioulia
, p. 325 - 337 (2005)
A new asymmetric transesterification of secondary alcohols catalyzed by feruloyl esterase from Humicola insolens has been found. Although alcohols are not the natural substrates for this enzyme, a high R enantioselectivity was observed. Stereochemical studies showed that variations in substrate structure lead to strong variations in enantioselectivity. The highest enantioselectivities are obtained when the β-carbon of the secondary alcohol is tertiary or quaternary.
Immobilized Manihot esculenta preparation as a novel biocatalyst in the enantioselective acetylation of racemic alcohols
Machado, Luciana L.,Lemos, Telma L.G.,de Mattos, Marcos Carlos,de Oliveira, Maria da Conceicao F.,de Gonzalo, Gonzalo,Gotor-Fernandez, Vicente,Gotor, Vicente
, p. 1418 - 1423 (2008/12/20)
The enzymatic preparation obtained from a discard of Manihot esculenta roots has been successfully immobilized on calcium alginate hydrogels. This preparation has been tested as a chiral biocatalyst in the enzymatic acylation of a set of racemic aromatic alcohols. Depending on the reaction conditions, excellent enantioselectivities can be achieved. Some parameters that can alter the biocatalytic properties of the enzyme, such as solvent, temperature, acyl donor and substrate structure have been studied exhaustively in order to establish a deeper knowledge of this novel biocatalyst.
Reaction of Hydrazones with Methoxy(tosyloxy)iodobenzene (MTIB): Tosylate Formation under Oxidative Conditions
Ramsden, Christopher A.,Rose, Helen L.
, p. 27 - 28 (2007/10/03)
Treatment of aromatic hydrazones 1 containing electron-withdrawing, reduction sensitive substituents with MTIB gives the corresponding tosylates 2 in high yield. When the tosylate is particularly reactive the thermodynamically more stable methyl ether 3 is isolated. Analogous reactions with DAIB give acetates 4 in high yield. Dialkyl hydrazones give olefinic products (e.g. 7 and 8). (+)-Camphor hydrazone 1k with either MTIB or DAIB gives both camphene 12 (major product) and tricyclene 11 (minor product) suggesting that a carbene pathway accounts for some of the material formed in these oxidations.
ESTERIFICACION DE DERIVADOS DE ESTIRENO CON ACIDO ACETICO EN PRESENCIA DE ACIDO PERCLORICO COMO CATALIZADOR
Cuesta, Pedro J. Martinez de la,Martinez, Eloisa Rus,Sosa, Rafael Palomino,Perez, Fuensanta I. Palomino
, p. 26 - 31 (2007/10/02)
The present work is focused to develop the production of esters from derivatives of styrene by acetic acid using perchloric acid as a catalyst.The kinetics of the reaction was studied and analysis of the variables was carried out.Key words: Esterification, styrene, perchloric, acid, acetic acid.
