A series of oxopyrazoline-4-spiro-oxirans and 4-diazo-3-methyl-1-phenyl-5-oxo-2-pyrazoline have been photolysed to generate reactive intermediates incorporating the pyrazolinone ring, which have been trapped with nucleophilic solvents and investigated by spectroscopic techniques.
S. N. E<img border="0" src="https://www.rsc.org/images/entities/char_0067_0305.gif" alt="[g with combining overline]" xmlns="http://www.rsc.org/schema/rscart38" />e, E. J. Gess, A. Thomas, P. Umrigar, G. W. Griffin, P. K. Das, A. M. Trozzolo and T. M. Leslie, J. Chem. Soc., Chem. Commun., 1980, 1263 DOI: 10.1039/C39800001263
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