Process for the preparation of sterically hindered hydroxyphenyl

Details Process for the preparation of sterically hindered hydroxyphenyl Process for the preparation of sterically hindered hydroxyphenyl

1986-04-21

1987-12-29

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

203DIG6, 203 33, 203 38, 560 67, C07C 6703

Patent

active

047162449

ABSTRACT:
If the transesterification of esters of formula II ##STR1## with alcohols of formula III A--OH).sub.m is catalysed by treatment with catalytic amounts of an organic or inorganic zinc salt and the resultant melt is subsequently distilled in a short-time distillation apparatus under specific conditions, then compounds of the formula ##STR2## are obtained in virtually quantitative yield, in which formulae I, II and III n is a number from 0 to 2, m is 1 or 2, A is a radical derived from an m-valent aliphatic alcohol, which radical contains 2 to 18 carbon atoms, B is methyl or tert-butyl and R is methyl or ethyl. The products thus obtained contain no troublesome by-products and do not have to be additionally purified.

REFERENCES:
patent: 3330859 (1967-07-01), Dexter et al.
patent: 3779945 (1973-12-01), Dexter et al.
patent: 4196301 (1980-04-01), Spivack et al.
patent: 4536593 (1985-08-01), Orban et al.

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