Trinuclear cis-dioxidomolybdenum(VI) complexes of compartmental C3 symmetric ligands: Synthesis, characterization, DFT study and catalytic application for hydropyridines (Hps) via the Hantzsch reaction

摘要: Abstract Trinuclear cis-dioxidomolybdenum(VI) complexes of the type [{MoVIO2(MeOH)}3L1-7] (1–7) have been synthesized using tris(H2ONO) donor ligands [H6L1-7 (I–VII)] assembled from benzene-1,3,5-tricarbohydrazide (bthz) and corresponding salicylaldehyde (sal). All were characterized by numerous techniques, such as FT-IR, UV–visible, NMR (1H 13C) spectroscopy, electrochemical study, elemental analysis, thermogravimetric study single crystal X-ray diffraction ligand III 1 5. In presence H2O2 an oxidant, these show excellent catalytic potential towards one-pot three-components [ethyl acetoacetate, benzaldehyde (or its derivatives) ammonium acetate] dynamic covalent assembly in Hantzsch reaction. Under solvent free conditions, high 98% conversion along with 100% selectivity diethyl 2,6-dimethyl-4-phenyl-1,4-dihydropyridine-3,5-dicarboxylate (1,4-DHP) has achieved 1 h. Although solvents do not improve conversion, they influence products. With elapse time, dihydropyridine to 2,6-dimethyl-4-phenylpyridine-3,5-dicarboxylate derivative occurs completes ca. 10 h a distinct color change, showing importance catalysts. Efforts made provide suitable reaction pathways for based on spectroscopic density functional theory studies.