The i.r., u.v., and 1H- and 13C-n.m.r. spectra of some acetylpyran-2,6-diones are discussed in relation to their tautomeric structures and compared with those of the acetylpyran-2,4-diones. Their reactions with primary amines to give Schiff bases, salts, pyridones or open-chain products as well as a thermal rearrangement of the Schiff bases are reported.
S. Tan, K. Ang and H. Jayachandran, J. Chem. Soc., Perkin Trans. 2, 1986, 973 DOI: 10.1039/P29860000973
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