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- W2003280016 abstract "The spectroscopic and kinetic properties of five new “trans” cyclohexene derivatives have been determined and compared with the properties of the three previously reported “trans” cyclohexenes. These properties appear to be remarkably constant for the whole series of investigated compounds, except for a few exceptions which can be easily explained. Therefore we propose the following properties as characteristic of a “trans” cyclohexene derivative. The maximum of the UV absorption band is shifted to the red by about 15 000 cm−1 with respect to the maximum of the intense ππ* absorption band of the cis form (at least when this band originates from the second ππ* transition). The activation energy for the thermal “trans” → cis isomerization is about 42 kJ mol−1 and the corresponding pre-exponential factor is in the range 1012 – 1013 s−1. If markedly different values are found for these parameters, another reaction is probably competing with the thermal isomerization. The presence of oxygen has little or no influence on the lifetime of the “trans” species but, when the “trans” species is populated via the perpendicular triplet, the amount of “trans” isomer is greatly reduced since the yield of conversion of the triplet interacting with oxygen than for the same triplet species in the absence of oxygen. This effect is amplified when a large proportion of the triplets are planar since the quenching of the planar triplet gives exclusively the cis ground state." @default.
- W2003280016 created "2016-06-24" @default.
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- W2003280016 date "1987-03-01" @default.
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- W2003280016 title "Some new examples of “trans” cyclohexenes: properties characteristic of these species" @default.
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- W2003280016 doi "https://doi.org/10.1016/0047-2670(87)80022-9" @default.
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