NMR Spectra and structure of 1-vinylpyrazoles

Conclusions A¹H and¹³C NMR spectral analysis permitted evaluation of electronic and steric effects in 1-vinylpyrazoles. 5-Methyl-1-vinylpyrazoles have predominantly S-cis-N² orientation, while 1-vinylpyrazoles without substituents at C⁵ are conformer mixtures.Deceased.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 5, pp. 1012–1018, May, 1985.