The synthesis of N-1 substituted 4-bromo-, 3,4-dibromo- and 3,4,5-trib
romopyrazoles starting from the NH-pyrazoles is described. C-13 Nmr sp
ectroscopic studies with the title compounds are presented, investigat
ing the influence of substituents on C-13-chemical shifts and C-13, H-
1 spin coupling constants.