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organic compounds
The crystal structure determination of 13H-dibenzo[a,g]fluoren-13-one, C21H12O, has shown the molecule to be distorted from planarity as a consequence of the repulsive interaction between an Ocarbonyl lone pair and the juxtaposed proton. These results substantiate an earlier indication of this interaction, suggested by a conspicuously low field absorption in the 1H NMR spectrum of this compound.
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