The crystal structures of two carbonyl-stabilised, ammonium ylides are reported; bond lenghts and angles indicate that the stabilisation results principally from electron delocalisation towards the carbonyl oxygen atom.
N. A. Bailey, S. E. Hull, G. F. Kersting and J. Morrison, J. Chem. Soc. D, 1971, 1429 DOI: 10.1039/C29710001429
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