The thesis is divided into three chapters Chapter 1¡BFlash vacuum pyrolysis of 2-chloro-N-arenylideneaniline gave quinolines by the intromolecular cyclization. And then, flash vacuum pyrolysis of 2-methoxy-N-arenylideneaniline gave the benzothiazole products by the bond cleavage and the radical reaction. Chapter 2¡BFlash vacuum pyrolysis of 32 gave Stemofuran C. And then, flash vacuum pyrolysis of 33 gave 31 which belonging to the former compound of E6 reported on the paper. We also found that we also could get 2-phenylbenzofuran by flash vacuum pyrolysis of 44. Chapter 3¡BFlash vacuum pyrolysis of furylmethyl benzoates¡Bbenzo- thienylmethyl benzoates and N-methylpyrrolylmethyl benzoates gave the corresponding products by the interconversion between vinylcarbene and cyclopropene.