5-Trifluoromethyl-1,2-dimethyl-1H-pyrazolium chlorides: synthesis and [formula omitted], [formula omitted], [formula omitted] and [formula omitted] NMR chemical shifts

Abstract

The one-pot synthesis of nine novel 5-trifluoromethyl-1,2-dimethyl-1H-pyrazolium chlorides 2 from the cyclocondensation of 4-alkoxy-1,1,1-trifluoro-3-alken-2-ones 1 [CF 3C(O)CH=C(R 1)OR, where R 1=H, Me, n-Pr, n-Hex, Ph, 4-Me-C 6H 4, 4-F-C 6H 4, 4-Cl-C 6H 4, 4-NO 2-C 6H 4, and R=Me, Et] with 1-2-dimethyl hydrazine, in quantitative yields, is reported. The 1 H , 13 C , 19 F and 35 Cl NMR chemical shifts of compounds 2 also are described.