Cycloaddition Reactions of 4,6-Diphenylthienooxadiazole and -thiadiazole with Acetylenes

Article abstract of DOI:10.1021/jo01303a007

4,6-Diphenylthieno<3,4-c><1,2,5>oxadiazole containing tetravalent sulfur reacted with acetylenes to give the corresponding 1:2 adducts, syn-2-cyano-5-(3-isoxazolyl)-2,5-dihydrothiophene derivatives, accompanied by benzoxadiazoles.The reaction proceeds via