The action of nitrenes on halogenothiophenes; formation of thiophene S,N-ylides
Abstract
When ethyl or phenyl azidoformate, or p-tolylsulphonyl azide are decomposed in warm tetrachlorothiophene, tetrachlorothiophene S,N-ylides are formed; 2,5-dichloro-, 2,5-dibromo-, and tetrabromo-thiophene on the other hand give products arising from attack at the α-position followed by rearrangement.