Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Patent
1984-12-12
1986-10-21
Killos, Paul J.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
560 75, C07C 6988
Patent
active
046187006
ABSTRACT:
Pentaerythrityl tetrakis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] is prepared by transesterifying a lower alkyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate with pentaerythritol in the presence of a basic catalyst, without addition of an inert solvent and in a 15 to 50% excess of lower alkyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate over the stoichiometric amount of 4 moles per 1 mole of pentaerythritol.
An extremely good yield of pure crystalline product is obtained by the process of the invention.
REFERENCES:
patent: 3644482 (1972-02-01), Dexter
Gubler Erich
Siegrist Max
Ciba-Geigy Corporation
Falber Harry
Killos Paul J.
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