Gas-phase pyrolysis of aminomethylene derivatives of Meldrum's acid [e.g.(2)]. gives enaminoenaminones [e.g.(5)] Deuterium labelling studies have shown that the mechanism involves tautomerism of the initial methyleneketene intermediate to an iminoketene, followed by a sequence of 1,5-hydrogen shifts.
H. J. Gordon, J. C. Martin and H. McNab, J. Chem. Soc., Perkin Trans. 1, 1984, 2129 DOI: 10.1039/P19840002129
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