Synthesis of Novel Photochromic Spiro Compounds based on Thieno[3,2-b]Pyrroles

ABSTRACT Two routes to thieno[3,2-b]pyrrolenines are developed and new spiropyranes and spirooxazines based on thienopyrrole are synthesized. Benzene ring in the chromene part of the spiro molecule is also replaced with thiophene one to give new merocyanines.