73473-83-3Relevant academic research and scientific papers
The Energy-Well of Diradicals, II. The 2,3-Dimethylene-1,4-cyclohexadiyl
Roth, Wolfgang R.,Scholz, Bernhard P.
, p. 1197 - 1208 (2007/10/02)
The trapping of the 2,3-dimethylene-1,4-cyclohexadiyl (2), generated by the thermolysis of 7, with 1,3-butadiene as well as with oxygen in the gas phase is described.These reactions compete with the intramolecular stabilisation of the diradical, yielding 3 and 4.From the temperature dependence of the competing processes the difference in the activation energies of these reactions is derived.On the assumption, that the trapping reaction with oxygen does not have any significant energy barrier, the energy-well of the diradical 2 is calculated to be 16 kcal/mol.
Thermolysis of 1,2,6,7-Octatetraene
Roth, Wolfgang R.,Scholz, Bernhard P.,Breuckmann, Rolf,Jelich, Klaus,Lennartz, Hans-Werner
, p. 1934 - 1946 (2007/10/02)
The energy profile for the rearrangement of 1 to 3 and 4 and their interconversion by way of 5 is established making use of kinetic methods and by the determination of the heat of hydrogenation of the individual products.For the Cope rearrangement 1 -> 4 the competition of concerted and non concerted reaction paths is demonstrated by trapping experiments.
