Cheletropic reaction
Kinetics
Columns: -Butadiene | 10 4 k /min −1 (30 °C) (± 1-2%) absolute | 10 4 k /min −1 (30 °C) (± 1-2%) relative | ΔH ‡ /kcal mol −1 | ΔS ‡ /cal mol −1 K −1
2-methyl | 1.83 | 1.00 | 14.9 | -15 | 2-ethyl | 4.76 | 2.60 | 10.6 | -20 | 2-isopropyl | 13.0 | 7.38 | 12.5 | -17 | 2-tert-butyl | 38.2 | 20.8 | 10.0 | -19 | 2-neopentyl | 17.2 | 9.4 | 11.6 | -18 | 2-cloro | 0.24 | 0.13 | N/A | N/A | 2-bromoethyl | 0.72 | 0.39 | N/A | N/A | 2-p-tolyl | 24.7 | 13.5 | 10.4 | -19 | 2-phenyl | 17.3 | 9.45 | N/A | N/A | 2-(p-bromophenyl) | 9.07 | 4.96 | N/A | N/A | 2,3-dimethyl | 3.54 | 1.93 | 12.3 | -18 | cis-1-methyl | 0.18 | 0.10 | N/A | N/A | trans-1-methyl | 0.69 | 0.38 | N/A | N/A | 1,2-dimethylene-cyclohexane | 24.7 | 13.5 | 11.4 | -16