Syntheses De Nouveaux Acides Tetrathiafulvalenecarboxyliques Et De Leurs Esters Methyliques

Different methylated tetrathiafulvalenecarboxylic acids are synthesized by a two or three steps procedure. The methylated tetrathiafulvalene species is lithiated using an equimolar amount of n-BuLi at −80°C. The lithiated compound is then either carbonated producing new acids 2 to 4, or treated with methylchloroformiate. The monoesters 9, 11 and 13 obtained are easily characterized by mass spectroscopy and then converted into acids 2 to 4 by saponification. New diesters 10 and 12 are also synthetized and characterized.