62678-49-3Relevant articles and documents
Thermolabile Hydrocarbons, XXII. Thermolysis of symm. Tetraalkyldiarylethanes and the Resonance Energy of α,α-Dialkylbenzyl Radicals
Kratt, Guenter,Beckhaus, Hans-Dieter,Ruechardt, Christoph
, p. 1748 - 1764 (2007/10/02)
The products and the activation parameters for the thermolysis reactions of the hydrocarbons 1 - 10 were determined.From correlations between ΔG% and the ground state strain Hsp or the change in strain during the dissociation process Dsp the steric acceleration of this reaction was analyzed quantitatively.A comparison of this analysis with a corresponding correlation for simple Cq - Cq alkanes results in a resonance energie of 8.4 +/- 1.1 kcal * mol-1 for α,α-dialkylbenzyl radicals.The origin of the appreciable variation of ΔS% in this series and for the poorer precision of ΔH% /Hsp correlations is discuss ed.