Abstract
The n.m.r. spectra of a series of 9-substituted 9,10-dihydroacridines are consistent with a molecular conformation in which a central boat-shaped ring has the larger substituent in the pseudo-axial orientation. The u.v. spectra of 9,10-dihydro-9-t-butylacridine and its derivatives show absorption maxima absent from the spectra of other 9,10-dihydroacridines.

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