Abstract:Electron‐bombardment of the N‐3‐hydroxy derivatives of the above‐mentioned condensed uracils revealed that the major fragmentations involved the heterocyclic ring. The most intense ion proved to be the M‐32 ion which was created by the loss of the NHOH radical from the molecular ion. Mechanisms for this transition are presented. Other fragmentations common to these systems are discussed and compared with those reported for the corresponding N‐3 deoxy analogs of the title compounds. The mass spectral fragmentat… Show more
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