[EN] STABILIZATION OF ORGANIC MATERIALS<br/>[FR] STABILISATION DE MATERIAUX ORGANIQUES
申请人:CIBA SC HOLDING AG
公开号:WO2006024611A2
公开(公告)日:2006-03-09
The invention describes a process for stabilizing an organic material against oxidative, ther- mal or light-induced degradation, which comprises incorporating therein or applying thereto at least a compound of the formula (I) wherein the general symbols are as defined in claim 1. The compounds of the formula I are especially useful as processing stabilizers for synthetic polymers.
Stabilization of Organic Materials
申请人:Gerster Michele
公开号:US20080269382A1
公开(公告)日:2008-10-30
The invention describes a process for stabilizing an organic material against oxidative, thermal or light-induced degradation, which comprises incorporating therein or applying thereto at least a compound of the formula (I) wherein the general symbols are as defined in claim
1
. The compounds of the formula I are especially useful as processing stabilizers for synthetic polymers.
A highly diastereoselective P-Michael addition of chiral aminophosphinic acids to achiral acrylates has been developed, leading to phosphinic dipeptideisosteres in high yields and dr of up to >50:1. The method allows for the diastereoselective preparation of target compounds without the need for chiral auxiliaries or P-chiral substrates. A possible mechanistic explanation involves a domino chirality
已开发出手性氨基次膦酸与非手性丙烯酸酯的高度非对映选择性 P-Michael 加成反应,可产生高产率的次膦二肽电子等排体,dr 高达 >50:1。该方法允许非对映选择性制备目标化合物,而不需要手性助剂或 P-手性底物。一种可能的机制解释涉及从氨基次膦酸到 P 中心的多米诺骨牌手性转移,通过关键的二苯甲基酯基团放大,然后转移到 α-碳。