Bulletin of the Chemical Society of Japan p. 2600 - 2607 (1985)
Update date:2022-08-10
Topics:
Niizuma, Shigeya
Sato, Nobuyoshi
Kawata, Hiroki
Suzuki, Yoshizo
Toda, Takashi
Kokubun, Hiroshi
The photoreactions of 2,4,6-triphenyl- (TPP), 2-t-butyl-4,6-diphenylpyrylium (2BDPP) and 2,4,6-triphenylthiopyrylium (TPTP) salts in tetrahydrofuran (THF) and/or 1,2-dimethoxyethane were investigated.Photoproducts were identified to be pyranyl radicals on the basis of photochemical behavior and ESR spectra.Quantum yields of one-electron reduction of TPP, 2BDPP, and TPTP were obtained to be 0.21, 0.047, and 0.53, respectively.The hf coupling constants of protons in the radicals were determined by simulation.The photoillumination of TPP in THF at low temperatures revealed that a certain intermediate radical species was involved in this one-electron photoreduction.
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