Process for the preparation of monoesters or diesters of-9,10-endoethano-9,10-dihydroanthracene-11,11-dicarboxylic acid and for the preparation of symmetrical or asymmetrical methylidenemalonates

US4931584A · kind A · utility

Assignee

• Laboratories UPSA · FR

Inventors

• Nicole Bru-Magniez · Paris, FR
• Christian Jean Charles De Cock · Ottignies-Louvain-la-Neuve, BE
• Jacques Henri Poupaert · Brussels, BE
• Jean-Luc De Keyser · Tervuren, BE
• Pierre Dumont · Albi, FR

Key dates

• Filing date: Mar 1, 1988
• Grant date: Jun 5, 1990
• Expiry date: Mar 1, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C69/38
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to novel monoesters and diesters of 9,10-endoethano-9,10-dihydroanthracene-11,11-dicarboxylic acid. These novel monoesters and diesters correspond to the following structural chemical formula (II): ##STR1## in which R.sup.1 and R.sup.2 are identical or different and can represent H, an alkali metal or alkaline earth metal atom, a linear or branched alkyl group having from 1 to 6 carbon atoms, an alicyclic group having from 3 to 6 carbon atoms, an alkenyl group having from 2 to 6 carbon atoms, defined in their cis or trans variety, or an alkynyl group having from 2 to 6 carbon atoms, the said groups optionally being substituted by one or more functional groups such as ether, epoxide, halogeno, cyano, ester, aldehyde, ketone, aryl etc., where R.sup.1 and R.sup.2 cannot be H or ethyl simultaneously. These addition products constitute valuable intermediates for the preparation of methylidenemalonates in high yields and with a high purity.