New derivatives of the 4,4 - dimethyl tetrahydro pyr - 2 - one, their process of preparation and their application to the synthesis of products pyrenthrinoids

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.