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Upstream product

• 6889-78-7 4'-(methoxy)-3-hydroxyflavone 
• 6711-48-4 N,N-bis-(3-dimethylaminopropyl)amine 

Relevant academic research and scientific papers

[3,3′-Iminobis(N,N-dimethylpropylamine)](4′-methoxyflavonola to) zinc(II) perchlorate, [Zn(4′-MeOfla)(idpaH)]ClO4

The title compound, [Zn(C16H11O4)(C10H 25N3)]ClO4, contains a cationic five-coordinate zinc(II) complex with distorted trigonal-bipyramidal geometry. Two N atoms of the tridentate 3,3′-iminobis(N,N-dimethylpropylamine) (idpaH) ligand and one O atom of the 4′-methoxyflavonolate (4′-MeOfla) ligand occupy basal positions, the other O atom of the flavonolate ligand and one N atom of the idpaH ligand being in apical positions. ? Alternative name: [3,3′-iminobis(N,N-dimethylpropylamine-N][2-(4-hydroxyphenyl)-4-oxo-4H- chromen-3-olato-O3,O4)zinc(II) perchlorate.

Kinetics and mechanism of the stoichiometric oxygenation of the ionic zinc(II) flavonolate complex [Zn(fla)(idpa)]ClO4 (fla = flavonolate; idpa = 3,3′-iminobis(N,N-dimethylpropylamine))

The preparation and characterization of [ZnII(4′R-fla)(idpa)]ClO4 (fla = flavonolate; idpa = 3,3′-iminobis(N,N-dimethylpropylamine) complexes were described. Oxygenation of ZnII(fla)(idpa)]ClO4 in dimethylformamide (DMF) solution at elevated conditions gave ZnII(idpa)(O-bs)]ClO4 (O-bs = O-benzoylsalicylate) and CO. The oxygenolysis of [ZnII(fla)(idpa)]ClO4 in DMF was followed by electronic spectroscopy and the rate constants were determined according to the rate law -d[{ZnII(fla)(idpa)}]ClO4]/dt = kobs [{ZnII(fla)(idpa)}ClO4][O2]. The rate constant, activation enthalpy and entropy at 373 K were kobs/M-sec =(3.11 ± 0.12) × 10-3, ΔH (kJ/mol) = 75 ± 5, @Delta;S (J/mol-K) = -96 ± 13. The reaction fitted a Hammett linear free energy relationship for 4′-substituted flavonols, and electron-releasing groups made the oxygenation reaction faster. In the course of the reaction O2·- was formed suggesting a SET mechanism. [ZnII(fla)(idpa)]ClO4 did not catalyze the oxygenation of flavonols.