Jensen, Bror Skytte published the artcileSolvent extraction of metal chelates. II. 1-Phenyl-3-methyl-4-acyl-5-pyrazolones, Synthetic Route of 1691-93-6, the main research area is .
cf. ibid. 1668; CA 56, 6718d. A comparison of the apparent mean complexity constants of various 1-phenyl-3-methyl-4-acyl-5-pyrazolones with Be++, Mn++, Zn++, Pb++, UO2++, La+++, and Th4+ in a CHCl3-H2O system shows a linear relation between the log of the distribution coefficient of an uncharged metal chelate and the log of the distribution coefficient of the un dissociated chelating agent, the slope of the line being characteristic of the metal ion. As expected, an increase of the aliphatic side-chain increases the lipophilic character of the chelating agent, and hence increases its distribution coefficient between organic phase and H2O. In the titration experiments, the chelating agents and the metal salts were 0.05 and 0.005M, resp.; when the media become alk. the metals forming slightly soluble hydroxides often precipitate out. Although some acetyl pyrazolones are inferior to, and others superior to, thenoyltrifluoroacetone (I), the caproylpyrazolone offers better separation than I for the above metal ions. As the capacity of the systems involved are rather large, and the separation adequate for many purposes, these compounds show promise as extractive chelating agents for anal. and radiochem. work.
Acta Chemica Scandinavica published new progress in CAplus about 1691-93-6, 1691-93-6 belongs to class pyrazoles-derivatives, name is 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, and the molecular formula is C12H9F3N2O2, Synthetic Route of 1691-93-6.
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics