On the mechanism of reactions of oncogenic n-acyloxypurines-III. Extent of radical participation1 1 This investigation was supported in part by Grants Number CA-08748 and CA-23622, awarded by the National Cancer Institute, DHEW. Ref. 20 is now designated as II in the series and Ref. 16 is designated as I.
UV irradiation of a model "activated ester" of the oncogen 3-hydroxyxanthine induced homolytic cleavage of the N-O bond and gave products arising by reduction of as well as by recombination of the solvent caged amidyl radical intermediate. Identification of the latter product constitutes the first evidence that a distinct product associated specifically with a radical from an acyloxypurine can be formed. The absence of this product among those formed spontaneously from 3-acetoxyxanthine provides the first indication that an amidyl radical is not an intermediate in the spontaneous reactions of N-acyloxy purines.
Parham, James C.,Templeton, Mary Agnes
p. 709 - 713
(2007/10/02)
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