Synthesis and spectral properties of some 1,2-dithienylethenes and 1-thieny1-4-phenylbutadienes

A total of seven thiophene derivatives not previously reported have been prepared via the Knoevenagel condensation of an activated methylthiophene and a heterocyclic or aromatic aldehyde. The principal peaks in the ultraviolet and visible absorption spectra as well as some nuclear magnetic resonance data are reported for these compounds.