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Reaction dynamics of the 4-methylphenyl radical (C6H4CH3; p-tolyl) with isoprene (C5H8) – formation of dimethyldihydronaphthalenes

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/c4cp01056f· OSTI ID:1602787
 [1];  [2];  [2];  [3]
  1. Univ. of Hawaii at Manoa, Honolulu, HI (United States). Dept. of Chemistry; University of Hawaii at Manoa
  2. Univ. of Hawaii at Manoa, Honolulu, HI (United States). Dept. of Chemistry
  3. Florida International Univ., Miami, FL (United States). Dept. of Chemistry and Biochemistry
We probed the reaction of the 4-methylphenyl radical with isoprene under single collision conditions at a collision energy of 58 kJ mol-1 by exploiting the crossed molecular beam technique. Supported by the electronic structure calculations, the reaction was found to initially lead to a van-der-Waals complex without any barrier which can then isomerize by addition of the 4-methylphenyl radical to any one of the four carbon atoms of the 1,3-butadiene moiety of isoprene. The initial addition products isomerize with formal addition products preferentially to C1 and C4 carbon atoms of the isoprene. These structures further isomerize via hydrogen migration and cyclization; the reaction is terminated by a hydrogen atom elimination from the 4-methylphenyl moiety via tight exit transition states leading to two dimethyl-dihydronaphthalene isomers as the dominating products. Here, this study presents one of the very first bimolecular reactions of the 4-methylphenyl radical with unsaturated hydrocarbons and opens a path for the investigation of this reaction class in future experiments.
Research Organization:
Univ. of Hawaii at Manoa, Honolulu, HI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
FG02-03ER15411; FG02-04ER15570
OSTI ID:
1602787
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 31 Vol. 16; ISSN 1463-9076; ISSN PPCPFQ
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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