Adenine 9-methyl-.ultraviolet absorption

A number of physicochemical properties which have been investigated for a series of simple derivatives of the different tautomeric forms of adenine, prominent among which are dipole moments and ultraviolet absorption spectra, throw additional light on the problem. Table VIII indicates the results of a theoretical evaluation of the dipole moments for the different tautomeric forms (12-19) of adenine as well as the experimental values of the moments in methyl and benzyl derivatives of these forms with the exception of the derivatives of the N(1)H form for which, unfortunately, no experimental data could be obtained because of lack of sufficiently soluble 1-substituted derivatives. 

Indications about ultraviolet absorption spectra of these compounds reproduced in Table IX are less clear-cut. The predicted wavelengths for the amine forms are increasing in the order N(9)H < N(7)Hbenzyl-adenine, they have been considered as corresponding to those of the... 

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