Mass-spectroscopic study of dihydro-8h-pyrano(thiopyrano)[4′,3′:4,5]thieno-[2,3-d]uracil derivatives
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When a saturated six-membered oxygen- or sulfur-containing heteroring is present in the thienouracil molecule, retrodiene decomposition of the uracil ring takes place in all cases in later stages of the fragmentation. Under the influence of electron impact the more saturated heteroring undergoes fragmentation first with ejection of CHO and SH radicals, respectively, or fragmentation proceeds via a retrodiene mechanism. This is probably associated with the primary localization of the positive charge in it in the molecular ion.
KeywordsOxygen Organic Chemistry Positive Charge Uracil Electron Impact
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