Journal of the Chemical Society. Chemical communications p. 1144 - 1145 (1983)
Update date:2022-08-17
Topics:
Coqueret, Xavier
Bourelle-Wargnier, Francoise
Chuche, Josselin
Toupet, Loic
Gas phase thermolysis of β-N,N-dimethylhydrazinopropeonates (1) provides a new route to pyrazolinones (2) involving a <1,4> methyl shift from nitrogen to carbon in the pyrazolinium ylide intermediates (3); the mechanism is supported by the isolation of ylides (3a, b, e), the structures of (3a) and (3e) being confirmed by X-ray crystallography.
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