Resumen

BELMAR, J. et al. SYNTHESIS OF 1-n-ALKYL-3-METHYL- AND 1-n-ALKYL-3- PHENYL-5-PYRAZOLONES AND FORMYL DERIVATIVES. Bol. Soc. Chil. Quím. [online]. 2001, vol.46, n.4, pp. 458-470. ISSN 0366-1644.  doi: 10.4067/S0366-16442001000400010.

3-Methyl- and 3-phenyl-5-pyrazolones were alkylated and formylated. The phenyl derivative was less reactive towards alkylation. However in the formylation step 1-n-alkyl-3-methyl- and 1-n-alkyl-3-phenyl-5-pyrazolones showed no difference in reactivity. The alkylated products exist as 5-pyrazolones in chloroform solutions and in dimethylsulfoxide their structure is a 5-hydroxy-pyrazole. Chloroform and dimethyl sulfoxide solutions of 4-formyl derivatives have a structure that is better described as 4-hydroxymethylene-5-pyrazolone

Palabras clave : pyrazolones; tautomers; alkylpyrazolones; ormylpyrazolones.