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
On etudie les transpositions degenerees du cation bicyclo [2.1.1] hexylium a l'aide de substrats optiquement actifs marques D et 13 C
在研究 les transpositions degenerees du cation bicyclo [2.1.1] hexylium a l'aide de substrats optiquement actifs marques D et 13 C
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.
Industrial Process for the Preparation of 17-Hydroxy-6Beta, 7Beta; 15Beta, 16Beta-Bismethylene-3-Oxo-17Alpha-Pregn-4-Ene-21-Carboxylic Acid Y-Lactone and Key Intermediates for this Process
申请人:Soros Bela
公开号:US20080200668A1
公开(公告)日:2008-08-21
The invention relates to an industrial process for the preparation of 17-hydroxy-6β,7β;15β,16β-bismethylene-3-oxo-17α-pregn-4-ene-21-carboxylic acid γ-lactone of formula (I), and to the key-intermediates for this process.
Process for the Preparation of 17-Hydroxy-6Beta, 7Beta; 15Beta, 16Beta-Bismethylene- 17Alpha-Pregn-4-Ene-3-One-21-Carboxylic Acid Y-Lactone and Key Intermediates for this Process
申请人:Galik Gyorgy
公开号:US20080194812A1
公开(公告)日:2008-08-14
The invention relates to a process for the preparation of 17-hydroxy-6β,7β;15β,16β-bismethylene-17α-pregn-4-ene-3-one-21-carboxylic acid γ-lactone of formula (I) as well as to key-intermediates for this process.