Synthèse des Acides O.Acétyl et O. Benzoylthiophènecarboxyliques et de Leurs Chlorures D'Acide et Esters

The unambiguous synthesis of five new o. benzoyl and o.acetylthiophenecarboxylic acids and simple derivatives (acid chlorides and esters) is reported (I-II: table II). These o. ketoacids might present the ring-chain tautomerism like o. formylacids. I. R.-N. M. R. spectroscopy and X. ray diffraction have been used to determine the positions of the substituent groups and the structure of these compounds. The physical results will be subsequently published.