The compounds are esters having the formula ##EQU1## wherein R.sub.1 and R.sub.2 are each independently alkyl, cycloalkyl, alkylthioethyl or alkylpolyoxyalkylene, Z is oxygen or sulfur, R.sub.3 is the group ##SPC1## R.sub.4 is hydrogen, alkyl, cycloalkyl or .alpha.-methylbenzyl, R.sub.5 is alkyl or cycloalkyl, R.sub.6 is hydrogen or alkyl and, provided when R.sub.4 is hydrogen, R.sub.6 is alkyl and R.sub.5 is located on the carbon atom ortho to the hydroxyl group, and A is a covalent carbon bond or lower alkylene. The esters of this invention are prepared by usual esterification procedures from a thioether isopropanol and an acid of formula ##SPC2## Or a derivative thereof, preferably the methyl ester. The thioether isopropanols are prepared by reaction of epichlorohydrin with an alcohol or mercaptan followed by the opening of the oxirane ring with a mercaptide to give the desired thioether isopropanol. The compounds are useful as stabilizers for organic materials, especially polyolefins, which degrade upon exposure to light and heat.
这些化合物是
酯类,具有以下式子:##EQU1## 其中R.sub.1和R.sub.2各自独立地是烷基,环烷基,烷基
硫基乙基或烷基聚氧烷基,Z是氧或
硫,R.sub.3是基团##
SPC1## R.sub.4是氢,烷基,环烷基或α-甲基苯基甲基,R.sub.5是烷基或环烷基,R.sub.6是氢或烷基,并且在R.sub.4是氢时,R.sub.6是烷基,R.sub.5位于对羟基的碳原子上,A是共价碳键或较低的烷基。本发明的
酯类是通过通常的酯化程序从
硫醚
异丙醇和以下式子的酸或其衍
生物制备而成:##
SPC2## 更好的是甲酯。
硫醚
异丙醇是通过
环氧氯丙烷与醇或巯基化合物反应,然后用巯基离子打开环氧环来得到所需的
硫醚
异丙醇制备的。这些化合物可用作有机材料的稳定剂,特别是聚烯烃,在光和热的作用下会降解。