Mild and selective hydrolysis of a large range of nitriles leading to carboxylic acids was achieved under neutral conditions by an immobilized and genetically modified enzyme preparation from Alcaligenes faecalis ATCC8750. This immobilized nitrilase has been shown to be an effective catalyst for the stereoselective hydrolysis of mandelonitrile 1a to R-(-)-mandelic acid 1c. This method is particularly
Process for the production of a sulphur-containing organic compound
申请人:AVENTIS ANIMAL NUTRITION S.A.
公开号:EP1260500A1
公开(公告)日:2002-11-27
A process for the production of an organic sulphur-containing product which comprises reacting a sulphur-containing compound with an unsaturated hydrocarbon in the presence of a boron compound at a temperature of less than or equal to 50°C.
[EN] METHOD OF PREPARING ALIPHATIC CARBOXYLIC ACIDS BY ENZYMATIC HYDROLYSIS OF ALIPHATIC NITRILE COMPOUNDS<br/>[FR] PROCEDE DE PREPARATION D'ACIDES CARBOXYLIQUES ALIPHATIQUES PAR HYDROLYSE ENZYMATIQUE DE COMPOSES NITRILES ALIPHATIQUES
申请人:ADISSEO FRANCE SAS
公开号:WO2002095045A2
公开(公告)日:2002-11-28
La présente invention concerne un nouveau procédé de préparation d'acides carboxyliques aliphatiques par hydrolyse enzymatique de composés nitriles aliphatiques caractérisé en ce que: (a) on prépare un matériel biologique ayant une activité nitrilase, (b) on immobilise ledit matériel biologique (c) on met en présence un composé nitrile avec le matériel biologique ainsi immobilisé, pour obtenir le sel d'ammonium de l'acide carboxylique aliphatique formé (d) éventuellement, on purifie l'acide formé.
A highly convergent and flexible strategy for the synthesis of a-ring aromatic steroids
作者:Lewis N. Mander、John V. Turner
DOI:10.1016/s0040-4039(01)81993-6
日期:1981.1
Using Hendrickson's criteria for systematic synthesis design, a strategy featuring a linear six carbon synthon (7) for bis-annulation has been devised for economic, flexible and highly convergent syntheses of A-ring aromatic steroids.