Patent ID: 6215006
Filing Date: 2001-04-10
Classification: C07D

Abstract:
A process for the preparation of a 3-isochromanone of the formula (I) ##STR5##by reaction of an o-chloromethylphenylacetic acid of the formula (II) ##STR6##at a temperature of 100 to 250.degree. C. in the presence or absence of an ionic halide, in the presence or absence of an organic solvent and with removal of hydrogen chloride, where in the formulae (I) and (II) the radicals R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another are:a hydrogen or fluorine atom;an NC or F.sub.3 C group;an alkyl, alkoxy or acyloxy radical, each having 1 to 18 carbon atoms; or a C.sub.6 -C.sub.18 -aryloxy.