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Zur Energie‐Delle von Diradikalen; III 1) 2,3,5,6‐Tetramethylen‐1,4‐cyclohexadiyl
Author(s) -
Roth Wolfgang R.,
Langer Reinhard,
Ebbrecht Thomas,
Beitat Arndt,
Lennartz HansWerner
Publication year - 1991
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19911241218
Subject(s) - diradical , chemistry , enthalpy , ketone , thermal decomposition , activation energy , photochemistry , medicinal chemistry , organic chemistry , thermodynamics , atomic physics , excited state , singlet state , physics
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.