The reversible addition reaction 2-Ċ3H7+ i-C4H8 ⇌ (CH3)2CHCH2Ċ(CH3)2 was studied in the temperature range 491-543 K by product analysis in experiments in which 2-Ċ3H7 radicals were generated by the thermal decomposition of azoisopropane. The enthalpy of formation of the radical (CH3)2CHCH2Ċ(CH3)2 was determined, the value obtained being ΔfH° = -21.8 ± 5.2 kJ mol-1. From this result, the following group value was deduced: ΔfH°[Ċ-(C)3] = 177.1 kJ mol-1. From the latter, ΔfH°(t-Ċ4H9) = 51.6 kJ mol-1 was estimated. The rate constant of self-combination of the radical (CH3)2CHCH2Ċ(CH3)2 was determined for the first time: log(k12/(dm3 mol-1 s-1)) = 7.3.
- (CH)CHCHĊ(CH) radical
- Enthalpy of formation
- Rate constant of combination
ASJC Scopus subject areas
- Physical and Theoretical Chemistry