A Stable Methyleneketene and the Stepwise Fragmentation of Meldrum's Acids
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 (13)C n.m.r. spectra and chemical reactions.
Lorencak, Primoz,Pommelet, J. C.,Chuche, Josselin,Wentrup, Curt