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Titolo:
PHOTODIMERIZATION OF 1-PHENYLCYCLOHEXENE - A NOVEL TRANSIENT-TRANSIENT COMPONENT
Autore:
UNETT DJ; CALDWELL RA; HRNCIR DC;
Indirizzi:
UNIV TEXAS,DEPT CHEM RICHARDSON TX 75083 UNIV TEXAS,DEPT CHEM RICHARDSON TX 75083
Titolo Testata:
Journal of the American Chemical Society
fascicolo: 7, volume: 118, anno: 1996,
pagine: 1682 - 1689
SICI:
0002-7863(1996)118:7<1682:PO1-AN>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
STRAINED DOUBLE-BONDS; STEREOCHEMISTRY; TRANS-1-PHENYLCYCLOHEXENE; CYCLOHEPTENE; PHOTOCHEMISTRY; INTERMEDIATE; CYCLOHEXENE; MECHANISM; EXAMPLES; ENONES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
44
Recensione:
Indirizzi per estratti:
Citazione:
D.J. Unett et al., "PHOTODIMERIZATION OF 1-PHENYLCYCLOHEXENE - A NOVEL TRANSIENT-TRANSIENT COMPONENT", Journal of the American Chemical Society, 118(7), 1996, pp. 1682-1689

Abstract

Low-temperature irradiations of 1-phenylcyclohexene (PC6) yield two singlet state 2 + 2 photodimers and two 4 + 2 cycloadducts. The 4 + 2 adducts are not observed in low intensity lamp irradiations at room temperature but are produced in significant quantities when PC6 solutionsare subjected to higher intensity laser irradiation. The results indicate a reaction mechanism involving two trans-PC6 molecules, The findings are consistent with earlier kinetic observations that the decay oftrans-PC6 adopts a significant second-order component at lower temperatures, The transient-transient reaction also occurs under triplet-sensitized low-temperature/low-intensity or room temperature/high-intensity irradiation conditions. Triplet-sensitized irradiations also yield significant amounts of the 2 + 2 photodimers produced by attack of thePC6 triplet on its ground state, Quantum yield studies reveal that the rate of addition of (3)PC6 to it, ground state is in the range 0.28to 4.0 x 10(5) L mol(-1) s(-1) consistent with the 1,2-biradical model for alkene triplet reactivity.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 06:51:33