Crossed Beam Reactions of the Phenyl (C6H5; X2A1) and Phenyl-d5 Radical (C6D5; X2A1) with 1,2-Butadiene (H2CCCHCH3; X1A')
- Univ. of Hawaii at Manoa, Honolulu, HI (United States); University of Hawaii at Manoa
- Univ. of Hawaii at Manoa, Honolulu, HI (United States)
- 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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journal | June 2019 |
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