ABSTRACT
I. INTRODUCTION From both economic and ecological points of view, substances derived from esters of monocarboxylic acids sulfonated in the a position form an interesting class of surfactants [1]. The general formula of these ex-sulfomonocarboxylic esters, also called ex-sulfo fatty acid esters or, in short, ex-ester sulfonates, is R 1-CH(S03Me)-COO-R2 (with R1 and R2 = alkyl groups, Me= alkali metal).
