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- W2118739172 abstract "Two syn-[2.2](1,6)- and -(3,6)phenanthrenophanes, 1a,b, were synthesized for the first time by means of intermolecular [2 + 2] photocycloaddition of the corresponding divinylphenanthrenes. Phenanthrenophanes 1a,b were obtained as mixtures of two (exo,exo and exo,endo) and three (exo,exo, exo,endo, and endo,endo) structural isomers, respectively, which were isolated by reversed-phase HPLC and gel permeation chromatography. All of the isomers, whose structures were characterized mainly on the basis of 1H NMR spectroscopy, were in a syn conformation. X-ray crystallographic analysis of exo,endo-1a was successful, also in agreement with the results of 1H NMR. Birch reduction of 1b, followed by DDQ oxidation, afforded [4.4](3,6)phenanthrenophane 5b in an anti conformation, due to opening of the cyclobutane rings. The absorption spectra of 1b were relatively similar to that of phenanthrene itself, while those of 1a were rather broadened and red-shifted compared to those of phenanthrene and 1b. In both cases, the..." @default.
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- W2118739172 date "2010-08-05" @default.
- W2118739172 modified "2023-09-26" @default.
- W2118739172 title "ChemInform Abstract: Synthesis, Structure, and Electronic Properties of syn-(2.2) Phenanthrenophanes: First Observation of Their Excimer Fluorescence at High Temperature." @default.
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- W2118739172 doi "https://doi.org/10.1002/chin.199624128" @default.
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