Zur Energie‐Delle von Diradikalen; III¹⁾ 2,3,5,6‐Tetramethylen‐1,4‐cyclohexadiyl

Abstract

Energy Well of Diradicals, III 1) . – 2,3,5,6‐Tetramethylene‐1,4‐cyclohexadiyl 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, ΔH° f (g)=100.8 kcal/mol.