Synthesis of epoxy (meth)acrylic esters by selective epoxidation of unsaturated (meth)acrylic esters using the system H2O2 - Na2WO4 under phase transfer catalysis
作者:Y. Fort、A. Olszewski-Ortar、P. Caubere
DOI:10.1016/s0040-4020(01)90120-6
日期:1992.1
Selective epoxidation of unsaturated (meth)acrylic esters by various classical epoxidizing agents was investigated. It is shown that high selectivity and good yields are obtained by using the system H2O2 (20%) - Na2WO4 under phase transfer catalysis. Under these conditions, the rigorous control of the temperature and of the initial pH allows to prevent polymerization during these selective epoxidations
研究了各种经典的环氧化剂对不饱和(甲基)丙烯酸酯的选择性环氧化。结果表明,在相转移催化下,通过使用H 2 O 2(20%)-Na 2 WO 4体系可以得到高选择性和高收率。在这些条件下,严格控制温度和初始pH值可防止在这些选择性环氧化过程中发生聚合。结果表明,环氧化的选择性取决于两个双键亲核性的差异。
[EN] HYDROPHILIC COMPOUNDS FOR OPTICALLY ACTIVE DEVICES<br/>[FR] COMPOSÉS HYDROPHILES DESTINÉS À DES DISPOSITIFS OPTIQUEMENT ACTIFS
申请人:MERCK PATENT GMBH
公开号:WO2017032444A1
公开(公告)日:2017-03-02
The present invention relates to novel compounds, particularly to hydrophilic compounds, comprising a photoactive unit, said novel compounds being particularly suitable for ophthalmic devices. The present application also relates to ophthalmic devices comprising such compounds.
Hydrophilic compounds for optically active devices
申请人:Merck Patent GmbH
公开号:US10723713B2
公开(公告)日:2020-07-28
The present invention relates to novel compounds, particularly to hydrophilic compounds, comprising a photoactive unit, said novel compounds being particularly suitable for ophthalmic devices. The present application also relates to ophthalmic devices comprising such compounds.