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US 3,939,210 AGranted
Selective oxyalkylation of mercaptophenols
AssigneeHooker Chemicals & Plastics Corporation
InventorFrancis J. Bajer
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Abstract
Mercaptophenols are selectively oxyalkylated at the mercapto function by a two-step process comprising reacting the mercaptophenol with a silylating agent to form novel silylated mercaptophenol derivatives and thereafter oxyalkylating the phenolic mercapto function to the degree of oxyalkylation desired. Simple hydrolyzing of the resulting product breaks the silylation block forming a hydrolyzed oxyalkylated mercaptophenol.
Claims8
A process for the selective oxyalkylation of a mercaptophenol of the formula:
- ##EQU5## wherein Ar is mono, di, tri or poly atomic phenol;
- each Z is independently selected from the group consisting of hydrocarbon, halogen or hydrogen and the sum of X and Y is the total remaining substitutable positions of Ar, comprising reacting said mercaptophenol with a silylating agent containing the silyl grouping
- R.sub.n Si.sup.-
- wherein R is a monovalent hydrocarbon radical and n is from 0 to 3, oxyalkylating the mercapto function of the resulting silylated mercaptophenol to the degree of oxyalkylation desired and therefrom hydrolyzing the product.
1 more element
Dependencies are inferred from the claim text.