Abstract It was established that in the 13 C NMR spectra of 4-hydroxymethylpyrazoles the carbon atom of hydroxymethyl group of 1, 3, 5-trimethyl-4-hydroxymethylpyrazole is deshielded by 6.28–6.78 ppm compared to 1-methyl-4-hydroxymethyl-, 1, 3-dimethyl-4- hydroxymethyl-and 1, 5-dimethyl-4-hydroxymethylpyrazoles. It is assumed that this difference is related to their dissimilar behavior at heating.
