59852-55-0Relevant academic research and scientific papers
Hindered hydroxyphenylalkanoates of thioether isopropanols
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, (2008/06/13)
The compounds are esters having the formula EQU1 wherein R1 and R2 are each independently alkyl, cycloalkyl, alkylthioethyl or alkylpolyoxyalkylene, Z is oxygen or sulfur, R3 is the group SPC1 R4 is hydrogen, alkyl, cycloalkyl or α-methylbenzyl, R5 is alkyl or cycloalkyl, R6 is hydrogen or alkyl and, provided when R4 is hydrogen, R6 is alkyl and R5 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.
