It has been established (1H and 13C n.m.r.) that for 9-formyltetrahydro-4H-pyrido[1,2-a]pyrimidin-4-ones the tautomeric system imine ⇌ enamine ⇌ enol-imine [(A) ⇌ (B) ⇌ (C)] is dominated by form (B) which is stabilized by internal hydrogen bonds. The presence of ca. 15% of (C) in the equilibrium was shown by 15N n.m.r. while no (A) could be detected.
|Number of pages||3|
|Journal||Journal of the Chemical Society, Perkin Transactions 2|
|Publication status||Published - Jan 1 1983|
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