GROSS TECHNICAL PROCEDURE FOR THE MANUFACTURE OF 17-HYDROXY-6BETA, 7BETA, 15BETA,16BETA-BISMETHYLEN-3-OXO-17ALPHA PREGN 4-EN-21-CARBONIC acid-GAMMA LACTON AND DECLARATIVE PRODUCTS FOR THIS PROCEDURE

摘要

The invention relates to an industrial process for the preparation of 17-hydroxy-6,7;15,16-bismethylene-3-oxo-17-pregn-4-ene-21-carboxylic acid -lactone of formula (I), and to the key-intermediates for this process.