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- W2000614948 abstract "The cycloreversion of 1,5-diphenylbicyclo[3.2.0]hept-6-ene (1) to 1,4-diphenyl-1,3-cycloheptadiene (2) has been studied by direct photolysis and radiolysis. The γ-radiolysis of 1 in benzene gave 2 quantitatively up to a stationary state where the ratio of 1 to 2 is 0 : 100. However, no isomerization of 2 to 1 occurred. The triplet state of 2 (λmax = 380—385 nm; τ = 2.7—2.8 μs) was formed by pulse radiolysis of 1 in benzene. It has been found that cycloreversion proceeds by an adiabatic mechanism via the triplet state. On the other hand, the quantum yield for the formation of 2 by the irradiation of 254 nm light to 1 was determined to be 0.64 in hexane. The fluorescence spectra of 1 and 2 also indicated that diabatic cycloreversion occurred. The singlet and triplet energy values of 1, as well as those of 2, were estimated to be 102, 78, 75, and 40 kcal mol−1, respectively. The energy difference between the ground states of 1 and 2 was determined to be 20 kcal mol−1 from DSC measurements." @default.
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- W2000614948 date "1993-03-01" @default.
- W2000614948 modified "2023-09-27" @default.
- W2000614948 title "Cycloreversion of Aryl-Substituted Cyclobutene by Direct Photolysis and Pulse Radiolysis" @default.
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- W2000614948 doi "https://doi.org/10.1246/bcsj.66.698" @default.
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