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The structure of three simple pyrazole-4-carboxylic acids unsubstituted in position 1 (N H  derivatives) 1 H -pyrazole-4-carboxylic acid ( 1 ), 3(5)-methyl-1 H -pyrazole-4-carboxylic acid ( 2 ) and 3,5-dimethyl-1 H -pyrazole-4-carboxylic acid ( 3 ) are discussed based on crystallographic results (two new structures) and solid-state NMR (CPMAS). Compounds  1  and  3  present polymorphism and one of the polymorphs of each compound shows solid-state proton transfer (SSPT). Compound  2  presents tautomerism that has been studied by NMR, both in the solid-state and in solution at low temperature.

The Structure and Dynamic Properties of 1 H -Pyrazole-4-Carboxylic Acids in the Solid State