Improved method of preparing esters of aryloxyphenoxy propanoic acid
申请人:THE DOW CHEMICAL COMPANY
公开号:EP0128658A1
公开(公告)日:1984-12-19
An improved method of preparing aryloxyphenoxy propanoic acid esters is disclosed. Low-water levels and low temperatures increase the yield and decrease by-product formation. A hindered non-nucleophilic phenol, which is converted in situ to the phenate form, is added to the reaction mixture to drive the reaction to 99+% conversion.
EFFENBERGER, FRANZ;ZOLLER, GERHARD, TETRAHEDRON, 44,(1988) N 17, C. 5573-5582
作者:EFFENBERGER, FRANZ、ZOLLER, GERHARD
DOI:——
日期:——
US4681941A
申请人:——
公开号:US4681941A
公开(公告)日:1987-07-21
Amino acids; 13
作者:Franz Effenberger、Gerhard Zoller
DOI:10.1016/s0040-4020(01)86062-2
日期:1988.1
The alkoxide-catalyzed addition of alcohols 2 to α-chloroacrylonitrile (1) at -35°C gives rise to 3-alkoxy-2-chloropropanenitriles 3; at 0–5°C with excess 2 alkyl 3-alkoxy-2-chloropropanimidates 4 are obtained. The yields of 3 or 4 decrease with increasing pKa values of the alcohols 2. In the base-catalyzed addition of phenols 5 to 1, a temperature-dependent addition equilibrium is set up in which