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- W2952948829 endingPage "313" @default.
- W2952948829 startingPage "270" @default.
- W2952948829 abstract "Though irradiation of cyclohexa-l,3-diene yields Z-hexa-1,3,5-triene, the reversed reaction is not observed in the parent system, neither thermally nor photochemically, or only to a very small extent. This example shows both the influence of substituents and of the wavelength of irradiation on the photoproduct composition. From extensive studies of these phenomena, the importance of the conformations in the ground state of the substrates for the formation of the photoproducts is evident, resulting in the formulation of the Non Equilibration of Excited Rotamers (NEER) principle. Examples discussed in this chapter can be ascribed to the geometries of the ground state conformations, which are unfavorable for electrocyclization of these compounds. Good examples of the influence of auxochromic groups together with a favorable, fixed conformation are also presented by some derivatives of dihydroxanthenones as reported by Ullman and Huffman." @default.
- W2952948829 created "2019-06-27" @default.
- W2952948829 creator A5041148885 @default.
- W2952948829 date "2003-01-01" @default.
- W2952948829 modified "2023-10-15" @default.
- W2952948829 title "4n+2 Systems: Molecules Derived from Z-Hexa-1,3,5-Triene/Cyclohexa-1,3-Diene" @default.
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