New 4,4-dimethyltetrahydro-2-pyrone derivatives, process for their preparation and their application to the synthesis of pyrethroid products

摘要

The subject of the invention is, by way of a new chemical product, under its various d, l and dl forms, the compound of formula I: <IMAGE> and the mixtures of these various forms. The product of formula I is useful in the preparation of pyrethroid products.