Patent ID: 6225484
Filing Date: 2001-05-01
Classification: C07C

Abstract:
A process for the preparation of a compound of formula I ##STR6##whereinR.sup.1 represents an optionally substituted aryl group,R.sup.2 represents an optionally substituted alkyl group, andR.sup.3 and R.sup.4 each individually represent an alkyl group; which comprises heating a mixture consisting essentially of(i) a compound of formula II ##STR7##wherein R.sup.1, R.sup.2 and R.sup.4 are as hereinbefore defined,(ii) an alcohol of formula III,R.sup.3 --OH (III)wherein R.sup.3 is as hereinbefore defined,(iii) a tri-alkoxymethane of formula IV,CH(OR.sup.3).sub.3 (IV)wherein R.sup.3 is as hereinbefore defined,(iv) an acid and optionally an inert diluent.