226998-13-6Relevant articles and documents
Charge-density and ring-size dependent dimerization of 1-arylcycloalkene cation radicals
Kojima, Masanobu,Ishida, Akito,Kuriyama, Yasunao,Oishi, Shigero
, p. 1557 - 1565 (2000)
The γ-radiolysis of 1-arylcyclopentenes [Ar = Ph (1a); 4-ClC6 H4 (1b); 4-MeC6H4 (1c); 4-MeOC6H4 (1d)] at 77 K initially gave transient absorption bands attributable to their monomer cation radicals (1a(·)+ - 1d(·)+), with λ(max) around 400 and 650 - 730 nm. In the case of 1a, 1b, and 1c, simultaneous formation of new absorption bands with λ(max) around 480 - 500 nm, attributable to the dimer cation radicals, was clearly observed upon warming along with a decrease in the monomer cation radical absorption bands. Using 355-nm laser photolysis at room temperature and an N- methylquinolinium salt as an electron acceptor, the rate constants for the formation of the dimer cation radicals (k(dimer)) and the reaction-rate constants for 1(·)+ with methanol (k(MeOH)) were determined. The reactivities of 1(·)+ with 1 and with methanol are discussed on the basis of the results obtained by a semiempirical molecular orbital calculation using the PM3 method. The results indicate that the reactivities of 1(·)+ depend not on its structure but on the charge density of the ethylene bond. In addition, dimerization of the cycloalkene cation radicals with larger ring size than 1, such as 1-phenylcyclohexene, 1-phenylcycloheptene, and 1- phenylcyclooctene cation radicals, was found to be remarkably dependent on the ring size.
1,n-Radical ions. Photosensitized (electron transfer) carbon-carbon bond cleavage. Formation of 1,6-radical cations
Arnold, Donald R.,Lamont, Laurie J.,Perrott, Allyson L.
, p. 225 - 233 (2007/10/02)
The reactivity of the radical cations of methyl 2,2-diphenylcyclohexyl ether (7), 6,6-diphenyl-1,4-dioxaspirodecane (8), methyl cis- and trans-2-phenylcyclohexyl ether (9cis and trans), and 6-phenyl-1,4-dioxaspirodecane (10), generated by photos
