A NEW SYNTHESIS OF 6-THIATHIOPHTHENES FROM ACETYLENIC β-DIKETONES

Abstract

Abstract A new method for the synthesis of 2,5-diaryl-6-thiathiophthenes is described involving the reaction of 1,5-diarylpent-1-yne-3,5-diones with phosphorus pentasulfide. The reaction of 3-chloro-6-thiathiophthenes with hydrazine hydrate gave pyrazole derivatives. Nitration of the 6-thiathiophthenes afforded the corresponding 4-nitro-1-oxa-6,6a-dithia-2-azapentalenes.