Carbon-13 NMR chemical shifts of 1-alkyl-3(5)-cyano-1H-pyrazole-4-carboxylic acid esters
作者:George E. Babbitt、Michael P. Lynch、James R. Beck
DOI:10.1002/mrc.1260280117
日期:1990.1
A compilation of 13C NMR chemical shifts for 13 pairs of 3‐ and 5‐cyano‐substituted pyrazole regioisomers is reported. All of the ring carbon and cyano carbon 13C chemical shifts show a regular, predictable correlation with the particular isomer, whether 3‐cyano or 5‐cyano. These shifts occurred in very narrow ranges, precluding any confusion of assignment within the group of compounds studied. x‐ray