Flash Vacuum Pyrolysis of Pyrazoles. An Alternative Way to Study Vinylcarbenes

ELIZABETH L. MOYANO; GLORIA I. YRANZO; JOSÉ ELGUERO

JOURNAL OF ORGANIC CHEMISTRY

AMER CHEMICAL SOC

Año: 1998 vol. 63 p. 8188 - 8191

0022-3263

Flash vacuum pyrolysis (FVP) reactions of 3,5-diphenylpyrazole (1) and 3(5)-methyl-5(3)-phenylpyrazole (2) were carried out. The reaction products expected for nitrogen extrusion were formed through different rearrangements in the vinylcarbene intermediate. Kinetic parameters for nitrogen extrusion from 1 are reported. To show that FVP reactions of pyrazoles are useful to obtainvinylcarbenes, the reactions of other pyrazoles previously studied are also discussed