NN-Disubstituted 4-imino-3,3-diphenylhexylamines show characteristic absorption bands near 1630 (C![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
N stretch) and 1715 cm.–1. The higher frequency bands, shown to be due to the imino-group by a deuteriation experiment, arise in the spectra of ketimines with a phenyl substituent α to the imine function, and are absent in those of simple dialkyl and diaryl derivatives.
A. F. Casy and M. M. A. Hassan, J. Chem. Soc. B, 1969, 631 DOI: 10.1039/J29690000631
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