Process for the preparation of intermediates for the synthesis of vitamin A derivatives from polyenes by cyclisation

Abstract

The application relates to a process for the preparation of a compound of formula (II) by cyclisation of a polyene of formula (I), and to an intermediate of formula (III). The obtained compounds are useful intermediates in the preparation of specific isoprenoids, preferably in the production of vitamin A and derivatives of vitamin A.

Dependencies are inferred from the claim text.