Spiro epoxides as intermediates

摘要

The present disclosure relates to compounds of formula I; wherein the substituents are as defined in claim 1. The compounds are suitable intermediates in the preparation of herbicidally active 4-phenyl-3,5-pyrandiones, 4-phenyl-3,5-thiopyrandiones and 6-phenylcyclohexane-1,3,5-triones.