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• W2001884265 endingPage "8779" @default.
• W2001884265 startingPage "8770" @default.
• W2001884265 abstract "Aiming to improve our understanding of the stability of radicals containing the allylic moiety, carbon−hydrogen bond dissociation enthalpies (BDEs) in propene, isobutene, 1-butene, (E)-2-butene, 3-metylbut-1-ene, (E)-2-pentene, (E)-1,3-pentadiene, 1,4-pentadiene, cyclohexene, 1,3-cyclohexadiene, and 1,4-cyclohexadiene have been determined by quantum chemistry calculations. The BDEs in cyclohexene, 1,3-cyclohexadiene, and 1,4-cyclohexadiene have also been obtained by time-resolved photoacoustic calorimetry. The theoretical study involved a DFT method as well as ab initio complete basis-set approaches, including the composite CBS-Q and CBS-QB3 procedures, and basis-set extrapolated coupled-cluster calculations (CCSD(T)). By taking the C(sp3)−H BDE in propene as a reference, we have concluded that one methyl group bonded to C3 in propene (i.e., 1-butene) leads to a decrease of 12 kJ mol-1 and that a second methyl group bonded to C3 (3-methylbut-1-ene) further decreases the BDE by 8 kJ mol-1. When the methyl group is bonded to C2 in propene (isobutene), an increase of 7 kJ mol-1 is observed. Finally, a methyl group bonded to C1 in propene (2-butene) has essentially no effect (−1 kJ mol-1). While this trend can be rationalized in terms of stabilization of the corresponding radical (through hyperconjugation and π-delocalization), the BDE values observed for the dienes can only be understood by considering the thermodynamic stabilities of the parent compounds." @default.
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• W2001884265 date "2007-10-09" @default.
• W2001884265 modified "2023-10-17" @default.
• W2001884265 title "Energetics of the Allyl Group" @default.
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• W2001884265 doi "https://doi.org/10.1021/jo701397r" @default.
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