Heterocyclic Communications p. 375 - 378 (2005)
Update date:2022-08-04
Topics:
Desalegn, Nebiyou
Vasquez, Pedro C.
Franklin, Paul J.
Kennedy, G. Davon
Baumstark
The thermal decomposition of trans-3-chloro-4,4,5-trimethyl-2,5-diphenyl-4, 5-dihydro-3H-pyrazole (1) produced 1,1,3-trimethyl-2-phenylindene (2) in excellent yield. A kinetic analysis showed that the reaction involved isolable diene intermediate(s) and yielded activation parameters for thermolysis of 1 of: ΔH?= 32.9 kcal/mole; ΔS?= -2.4 eu; ΔG?= 33.9 kcal/mole; k1, (180°C) - 1.3×10-3s -1.
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