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The electric dipole moments and the U.V. absorption spectra of some adenine derivatives were measured, In agreement with theoretical predictions, the moments of the N ( 7 ) H tautomer derivatives were found to be by several debyes higher than those of the derivatives of the N ( 9 ) H and N ( 3 ) H tautomers. The N ( 3 ) H tautomer of adenine is possibly a mixture of the amine and the imine forms, while the N (7) H and N (9) H tautomers exist wholly in the amine form.

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