CYCLOADDITIONS .19. KINETICS OF THERMAL DECOMPOSITION OF 2,5-DIARYLTETRAZOLES

The kinetics of the thermal decomposition of nine 2,5-diaryltetrazoles at 165.8° have been determined manometrically. For 2-aryl-5-phenyltetrazoles, a plot of log k against the Hammett substituent constants gives a good straight line with slope ρ{variant} = 1·16. For 2-phenyl-5-aryltetrazoles, ρ{variant} = -0·23. The pertinence of these results to the mechanism of the cycloadditions of 1,3-diarylnitrile imines is discussed. © 1968.