Method for synthesizing monoesters or diesters of 9,10-endoethano-9,10-dihydroanthracene-11,11-dicarboxylic acid, novel monoesters or diesters obtained by this synthesis method, and uniform or irregular methyl esters Application of Ridenmalonate to Synthesis

摘要

These new mono- and diesters correspond to the following chemical structural formula (II): …IMAGE… in which R1 and R2 are identical or different and may denote H or an alkali or alkaline-earth metal atom, a linear or branched alkyl group containing from 1 to 6 carbon atoms, alicyclics containing from 3 to 6 carbon atoms, alkenyls containing from 2 to 6 carbon atoms, defined in their cis or trans form, or else alkynyls containing from 2 to 6 carbon atoms, optionally functionalised by one or more groups such as ether, epoxide, halo, cyano, ester, aldehyde, ketone, aryl etc., where R1 and R2 cannot simultaneously be H or ethyl. These addition products constitute valuable intermediates for the preparation of methylidenemalonates in high yields, in a high purity.