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- W2017035654 abstract "Abstract A series of cyclic α ‐diketones incorporating a benzene ring (ortho, meta or para substituted) have been synthesized for studies of intramolecular energy transfer (intra‐ET). The synthetic method involved acyloin cyclization of the corresponding dicarboxylic acid diesters followed by oxidation with DMSO‐acetic anhydride reagent. All compounds were sufficiently flexible so that, even at temperatures in the range of −120°, only broadened lines were observed in their NMR spectra, consistent with observations on temperature dependence of the intra‐ET process. The structure of one compound (P‐4,4) was established by X‐ray crystallographic analysis and of the remaining compounds by a combination of spectroscopic data and molecular mechanics calculations. The calculated structure of P‐4,4 is essentially identical to the X‐ray structure. In all compounds the methylene chains assume staggered conformations, the dicarbonyl torsion angle aproached 180°, and the molecule folds in such a way that, with one exception, the dicarbonyl moiety lies above (or below) the plane of the benzene ring. Distances between chromophores range from about 3.3 to 5.8 Å." @default.
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- W2017035654 date "1985-01-01" @default.
- W2017035654 modified "2023-09-25" @default.
- W2017035654 title "Synthesis and Structures of Substrates for Investigation of Intramolecular Electronic Energy Transfer" @default.
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- W2017035654 doi "https://doi.org/10.1002/ijch.198500012" @default.
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