| Abstract
| - 3,4-Cyanomethyl substituted thiophenes reacted with thionyl chloride in the presence of base togive dicyano substituted thieno(3,4-c)thiophenes. The use of selenium oxychloride furnished thecorresponding cyano substituted seleno(3,4-c)thiophene. 1,2-Phenylenediacetonitriles gave thecorresponding cyano substituted benzo(c)thiophenes and benzo(c)selenenophenes, respectively, uponreaction with thionyl chloride and selenium oxychloride in the presence of base.
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