Benzyl, diphenyl, and triphenyl methane derivatives

This is in strong contrast to the ring twisting observed for the triphenylmethanide anions with twist angles in the range of 30°. 

While the di- and triphenylmethanide anions are resonance stabilized, there is a tendency for isolating the 7T-system with a systematic localization of the double bonds this discrete arrangement of single and double bonds has been observed and studied in detail in alkali bisdipyridylmethanides.43-45 

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