3,3-Diphenyl-5-triphenylphosphinio-Δ1-pyrazoline bromide and 4-triphenylphosphonio-Δ1-pyrazoline bromide were prepared and generalized reactions for 1,3-dipolar adducts of vinyl phosphonium salts were suggested and illustrated using the aforementioned species.
E. E. Schweizer, C. S. Kim and R. A. Jones, J. Chem. Soc. D, 1970, 39 DOI: 10.1039/C29700000039
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