Heparin esters and processes for their preparation

Claim 1

Esters of heparin, which are derived from heparin by replacement of the carboxyl groups of heparin by groups of the formula: ##STR13## in which R is hydrogen or methyl and A is hydrogen, methyl, phenyl, ##STR14## X representing chlorine, nitro, alkyl containing 1 to 4 carbon atoms or methoxy and Y representing hydrogen or chlorine, the replacement being a partial or total replacement when A is other than hydrogen, methyl or phenyl, and, when A is hydrogen, methyl or phenyl, the replacement being a partial replacement corresponding to a 10% to 90% esterification percentage of the carboxyl groups and the esters being selective esters wherein are esterified, partially or wholly, either only the carboxyl groups of the D-glucuronic acid linkages, only the carboxyl groups of the D-glucuronic acid and unsulfated L-iduronic acid linkages, only the carboxyl groups of the unsulfated L-iduronic acid and sulfated L-iduronic acid linkages, or only the carboxyl groups of the sulfated L-iduronic acid linkages, and the alkali metal, alkaline earth metal, magnesium, quaternary ammonium and triethylamine, pyridine and imidazole salts of said esters.