Etude De La Conformation D'oximes Thiopheniques

Abstract

The condensation of 2,5-diformylthiophene with hydroxylamine hydrochloride leads to the formation of three isomers. Two isomers 1' and 1" present a second order axis of symmetry; compound 1' is present with the configuration ZZ and exists in the conformation a and compound 1" is present with the configuration EE and exists in the conformation b. The last isomer 1"' presents the e (2,E) conformation. INTRODUCTIONLa 2-thiophene aldoxime peut exister, soit sous la configuration 2 (ou anti), soit sous la configuration E (ou syn.).