Synthesis of some imine, from pyrazole -1- carbaldehyde compound

الملخص EN

In this paper the synthesis of N [(1E)-1- ( 3,5.- disubstituted phenyl -4,5- dihydro -1H- pyrazol-1- yl) ethylidene or methylidene] substituted aniline [13-15] [17-19] and 1,1-{benzene- 1,4- or -1,3- diylbis [nitrilo (E) methylylidene]} bis( 4,5- dihydro -1H- pyrazole -3,5- disubstituted phenyl) [16,20] is reported.

Substituted acetophenone was treated with substituted benzaldehyde to give chalcones ((2E)-1,3- disubstituted phenyl prop-2-ene-1- one) [1-4], the chalcones was treated with hydrazine hydrate in the presence of formic or acetic acid ethanol to give 1-(3,5.-disubstituted phenyl-4,5- dihydro-1H- pyrazol-1- yl) methanol or ethanone [5-12], then this products changed to imines through reaction with substituted aromatic aniline and sodium hydroxide in ethanol to give the substituted pyrazoles.

Also, the substituted compounds [5-12] were converted to 1-{(1E) -1- [2- (2,4- dinitrophenyl) hydrazinylidene] methyl or ethyl} - 4,5- dihydro -1H- pyrazole -3,5- disubstituted phenyl [21- 28] by reaction with 2,4- dinitrophenyl hydrazine in ethanol.

The synthetic compound’s structure confirmed by IR., UV.

Spectra and physical method.