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The Very low-pressure pyrolysis of 2-phenylethylamine. The enthalpy of formation of the aminomethyl radical

✍ Scribed by A. J. Colussi; S. W. Benson

Publisher: John Wiley and Sons
Year: 1977
Tongue: English
Weight: 447 KB
Volume: 9
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550090213

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✦ Synopsis

The thermal unimolecular decomposition of 2-phenylethylamine (PhCHZCHzNH,) into bensyl and aminomethyl radicals has been studied under very-low-pressure conditions, and the enthalpy of formation of the aminomethyl radicals, A H 7 , z p s ~ (HzNCHZ.) = 37.0 f 2.0 kcal/mol, hm been derived from the kinetic data. This result leads to a value for the C-H bond dissociation energy in methylamine, BDE(H2NCH2-H) = 94.6 f 2.0 kcal/mol, which is about 3.4 kcal/mol lower than in C*H, (98 kcal/mol), indicating a sizable stabilization in or-ami noalk yI radicals.

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