Thermal dimerization of 1,3-cyclohexadiene in the gas phase

The thermal dimerizations of 1,3-cyclohexadiene(Chd), 2 Chd→exo-dicyclohexadiene (D3) kD3 (a) and 2 Chd→endo- dicyclohexadiene (D4) kD4 (b) have been studied between 471.1 and 638.5 K at pressures ranging from 25 to 630 Torr. These reactions are second order and the rates are unaffected by the surface-to-volume ratio or by the presence of added propene. The rate constants are given by log 10kD3(l. mol-1 s-1)=-(25 100±500)/4.576 T+(5.97±0.25), and log10k D4(l. mol-1 s-1)=-(24 300±500)/4.576 T+(6.08±0.25).SCOPUS: ar.j