277-87-2Relevant articles and documents
Energy Well of Diradicals, III. - 2,3,5,6-Tetramethylene-1,4-cyclohexadiyl
Roth, Wolfgang R.,Langer, Reinhard,Ebbrecht, Thomas,Beitat, Arndt,Lennartz, Hans-Werner
, p. 2751 - 2760 (2007/10/02)
Gasphase thermolysis of ketone 1 leads to title diradical 3, which in the presence of oxygen yields 5 and peroxides.Assuming that the trapping reaction is collision-controlled, from the temperature dependence of the competing processes an activation enthalpy of 23 kcal/mol is derived for the recombination of the diradical.By the same technique starting from 5 the heat of formation of the diradical has been determined, ΔHf0(g) = 100.8 kcal/mol.Key Words: Diradicals / Oxygen trapping / Shock-tube technique / Heats of formation / Heats of hydrogenation