Purification of esters of tetrahydro-pyran-4-carboxylic acid

Details Purification of esters of tetrahydro-pyran-4-carboxylic acid Purification of esters of tetrahydro-pyran-4-carboxylic acid

1994-01-24

1995-05-09

Chan, Nicky

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30908

Patent

active

054140978

ABSTRACT:
A process for purifying esters of tetrahydropyran-4-carboxylic acid of the formula I ##STR1## where R.sup.1 to R.sup.3 are each C.sub.1 -C.sub.4 -alkyl, and R.sup.2 and R.sup.3 are each additionally hydrogen, from mixtures produced in the reaction of butyrolactones of the formula II ##STR2## where R.sup.2 and R.sup.3 have the abovementioned meanings, and R.sup.4 is hydrogen, alkyl of 1-6 carbons or acyl of the formula --CO--R.sup.2, with alcohols of the formula R.sup.1 OH in the presence of oxide catalysts, by distillation, which entails

REFERENCES:
patent: 4837346 (1989-06-01), Fischer et al.

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