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

1984-12-12

1986-06-10

Killos, Paul J.

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

Organic compounds

Carboxylic acid esters

560 75, 560 57, 560 65, C07C 6988

Patent

active

045944440

ABSTRACT:
If the transesterification of esters of the formula II ##STR1## with alcohols of the formula III ##STR2## is catalyzed by treatment with catalytic amounts of an oxide or an organo-metallic compound of a metal of the fourth main group or subgroup of the periodic system, and if the resulting melt is then distilled in a flash distillation apparatus under specific conditions, compounds of the formula ##STR3## are obtained in a virtually quantitative yield. In the above formulae, R is methyl or ethyl, A is a radical of an m-hydric aliphatic alcohol, E is methyl or tert-butyl, m is 1 to 4 and n is 0 to 2. The products thus obtained do not contain any interfering by-products and do not have to be additionally purified.

REFERENCES:
patent: 3330859 (1967-07-01), Dexter
patent: 3779945 (1973-12-01), Dexter
patent: 4417071 (1983-11-01), Rosenberger
patent: 4536593 (1985-08-01), Orban

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