Flash Vacuum Pyrolysis (F.V.P.) of 1,2,4-benzotriazine derivatives

ZSUZANNE RIEDL; GYORGY HAJOS; WALTER PELÁEZ; IOULIA GAFAROVA; ELIZABETH L. MOYANO; GLORIA I. YRANZO

TETRAHEDRON

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2003 vol. 59 p. 851 - 856

0040-4020

Abstract—Flash vacuum pyrolysis of 3-methylsulfanyl-1,2,4-benzotriazine N-oxide, 3-methylsulfanyl- 1,2,4-benzotriazine, and 3-phenyl-1,2,4-benzotriazine are described. The N-oxide derivative underwent deoxygenation between 500 and 6008C, whereas at higher temperatures both methylsulfanyl compounds, besides yielding the same products, also gave benzimidazole formed by an independent mechanism.Transformation of these derivatives between 600 and 7508C led to formation of a complex reaction mixture indicating the radical nature of the processes. The phenyl substituted derivative was studied between 575 and 6508C and afforded benzonitrile and traces ofbiphenylene.