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- W2953018197 abstract "Substituted 2-acyl-2,3-dihydro-4H-pyrans 1–5 and 7, when irradiated at 254 nm, undergo ring contraction to form 1,2-diacylcyclobutanes and cleavage by retro-Diels-Alder reaction through the common intermediate 34. Excitation at 313 nm of the carbonyl 1(n,π*) state of compounds 1–5 leads to the unsaturated acetals 8–12 while the benzoyl derivative 6 gives only polymers and the aldehyde 7 undergoes decarbonylation. The same cyclisation occurs with 4-acetylcyclohexene 28. This reaction which leads stereoselectively to the isomer in which the substituent R is exo, originates from the 1(n,π*) singlet state as demonstrated by quenching experiments. Interaction of this chromophore with the carbon-carbon double bond is demonstrated by comparing the olefinic compounds with that of the corresponding saturated analogues." @default.
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- W2953018197 date "1979-09-25" @default.
- W2953018197 modified "2023-09-27" @default.
- W2953018197 title "ChemInform Abstract: PHOTOCHEMISTRY IN SOLUTION. PHOTOREACTIVITY OF 2,3-DIHYDRO-4H-PYRAN DERIVATIVES" @default.
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- W2953018197 doi "https://doi.org/10.1002/chin.197939092" @default.
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