Mild Flash vacuum pyrolysis of the Meldrum's acid derivative (3) gives the first example of a methylenemalonic anhydride (4), which decarboxylates in solution to give the first isolable methyleneketene (5); the structures are supported by 13C n.m.r. spectra and chemical reactions.
P. Lorenčak, J. C. Pommelet, J. Chuche and C. Wentrup, J. Chem. Soc., Chem. Commun., 1986, 369 DOI: 10.1039/C39860000369
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