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Pyrolysis of 2‐phenylethylamines heats of formation of aminomethyl radicals R 2 NCH 2 · (R = H, CH 3 )
Author(s) -
Grela M. A.,
Colussi A. J.
Publication year - 1985
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550170302
Subject(s) - chemistry , radical , ethylbenzene , pyrolysis , standard enthalpy of formation , alkyl , medicinal chemistry , kinetic energy , organic chemistry , benzene , physics , quantum mechanics
A kinetic study of the very low‐pressure pyrolysis of ethylbenzene (I), 2‐phenylethylamine (II), and N , N ‐dimethyl 2‐phenylethylamine (III)above 900 K yields the heats of formation of aminomethyl ( A ) and N , N ‐dimethylaminomethyl ( B ) radicals: Δ H ƒ, 300 K ( A ) = 30.3 and Δ H ƒ, 300 K ( B ) = 27.5 kcal/mol. The difference of stabilization energies E s , (relative to methyl radicals): Δ = E s ( B ) − E s ( A ) = (2 ± 1) kcal/mol, conforms to similar effects in methyl substituted alkyl and amino free radicals.