One-Pot Synthesis of Some New Semicarbazone, Thiosemicarbazone, and Hydrazone Derivatives of 1-Phenyl-3-Arylpyrazole-4-Carboxaldehyde from Acetophenone Phenylhydrazones Using Vilsmeier–Haack Reagent
Abstract Semicarbazone derivatives 3 of 1,3-diphenylpyrazole-4-carboxaldehyde have been synthesized in high yields through a one-pot procedure involving acetophenone phenylhydrazones 1 subjected to Vilsmeier double formylation and workup under new conditions (i.e., treatment with semicarbazide followed by sodium bicarbonate). This method is even suitable for preparing other derivatives (i.e., thiosemicarbazones
Novel Bioactive Thio- and Semicarbazide Ligands and Their Organosilicon (IV) Complexes
作者:Rajesh Malhotra
DOI:10.1080/10426500903348021
日期:2010.8.25
Ligationalbehavior of thiosemicarbazones and semicarbazones derived from 1-phenyl-3-arylpyrazole-4-carboxaldehydes towards triphenylchlorosilane has been investigated by elemental analysis, molar conductivity measurements, and IR, 1H, 13C, and 29Si NMR spectroscopic studies. The ligands and their organosilicon complexes have also been evaluated for in vitro antimicrobial activity against some pathogenic