Pyrrole studies. X. The preparation and electronic spectra of phenyldipyrromethenes

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Abstract
The NH frequency and the electronic spectra of 22 phenyldipyrromethenes have been measured. The spectral data confirm the presence of steric interaction between phenyl groups in the 3,3?-positions, but it was not possible to ascertain whether the interaction is relieved by a loss of coplanarity of the dipyrromethene system or by rotation of the dipyrromethene rings. The synthesis of 12 new phenyl-pyrroles is also described.

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