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Crossed Beam Reactions of the Phenyl (C6H5; X2A1) and Phenyl-d5 Radical (C6D5; X2A1) with 1,2-Butadiene (H2CCCHCH3; X1A')

Journal Article · · Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory
DOI:https://doi.org/10.1021/jp411642w· OSTI ID:1602786
 [1];  [2];  [2];  [2];  [3];  [3]
  1. Univ. of Hawaii at Manoa, Honolulu, HI (United States); University of Hawaii at Manoa
  2. Univ. of Hawaii at Manoa, Honolulu, HI (United States)
  3. Florida International Univ., Miami, FL (United States)

We investigated the reactions on the phenyl (C6H5; X2A1) and phenyl-d5 (C6D5; X2A1) radical with 1,2-butadiene (C4H6; X1A') at a collision energy of about 52 ± 3 kJ mol–1 in a crossed molecular beam apparatus. The reaction of phenyl with 1,2-butadiene is initiated by adding the phenyl radical with its radical center to the π electron density at the C1/C3 carbon atom of 1,2-butadiene. Later, the initial collision complexes isomerize via phenyl group migration from the C1/C3 carbon atoms to the C2 carbon atom of the allene moiety of 1,2-butadiene. The resulting intermediate undergoes unimolecular decomposition through hydrogen atom emission from the methyl group of the 1,2-butadiene moiety via a rather loose exit transition state leading to 2-phenyl-1,3-butadiene in an overall exoergic reaction (ΔRG = -72 ± 10 kJ mol–1). This result reveals the strong collision-energy dependence of this system when the data are compared with those of the phenyl radical with 1,2-butadiene previously recorded at collision energies up to 160 kJ mol–1, with the previous study exhibiting the thermodynamically less stable 1-phenyl-3-methylallene (ΔRG = -33 ± 10 kJ mol–1) and 1-phenyl-2-butyne (ΔRG = -24 ± 10 kJ mol–1) to be the dominant products.

Research Organization:
Univ. of Hawaii, Honolulu, HI (United States); Florida International Univ., Miami, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
FG02-03ER15411; FG02-04ER15570
OSTI ID:
1602786
Journal Information:
Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory, Journal Name: Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory Journal Issue: 25 Vol. 118; ISSN 1089-5639
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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