Synthesis and reactions of thiophene sulfides. Communication 40. An unusual reaction of 2,5-bis(methylthio)-3,4-bis(o-hydroxyphenyliminomethyl)thiophene

Abstract

In polar solvents (ethanol and chloroform), 2,5-bis(methylthio)-3,4-bis-(o-hydroxyphenyliminomethyl) thiophene undergoes intramolecular rearrangement to 2,5-bis(methylthio)-3-(2′-benzoxazolyl)-4-(o-hydroxyphenylaminomethyl) thiophene.