Synthesis and Physicochemical Properties of Some β‐Ketoaminato Cobalt(II) Chelates and Their Adducts with 2,2′‐Bipyridine and 1,10‐Phenanthroline
摘要:
The cobalt(II) beta-ketoamines complexes {Co[CH3C(O)CHC(CH3)NR](2); R = CH3, CH2(OH)CH2, C4H9} and ketoiminates {Co[CH3C(O)CH(CH3) C(-N(CH2)(n)N-)C(CH3)CHC(O)CH3]} and their adducts with 2,2'-bipyridine (bipy) and 1,10-phenanthroline (phen) have been synthesized and characterized by elemental analyses, magnetic susceptibility, conductivity, infrared, and electronic spectral measurements. The ligands coordinate to the cobalt ion in a bidentate manner using the N2O2 chromophore. The effective magnetic moments (mu(eff)) observed for the complexes are in the range of 4.20-5.30 BM. Electronic spectra results and magnetic susceptibility measurements are consistent with the adoption of a four-coordinate geometry for the cobalt(II) chelates and a six-coordinate octahedral geometry for the 2,2'-bipyridine and 1,10-phenanthroline adducts. The available conductance data in nitromethane indicates that the compounds are non-electrolytes.
New boronates prepared from 2,4-pentanedione derived ligands of the NO2 and N2O2 type – comparison to the complexes obtained from the corresponding salicylaldehyde derivatives
heterocycle had been reported, it becomes apparent that there may be differences in reactivity when comparing 2,4-pentanedione and salicylaldehydederived ligands. The molecular compositions of the boron complexes prepared from acacenH2 and acacpenH2 are analogous to the corresponding salen and salpen derivatives, however, the presence of two methyl groups in the six-membered chelate rings generates some structural
Cerium(III) Chloride Heptahydrate (CeCl3 · 7H2O) as an Efficient Enamination Catalyst in Aqueous Media
作者:M. M. Khodaei、A. R. Khosropour、M. Kookhazadeh
DOI:10.1007/s11178-005-0363-z
日期:2005.10
Cerium(III) chloride heptahydrate CeCl3 · H2O catalyzes enamination of β-dicarbonyl compounds with primary amines in aqueous medium at room temperature to afford the corresponding β-enamino ketones with high chemoselectivity.
The role of a Lewis acid in the Nenitzescu indole synthesis
作者:Valeriya S. Velezheva、Andrey I. Sokolov、Albert G. Kornienko、Konstantin A. Lyssenko、Yulia V. Nelyubina、Ivan A. Godovikov、Alexander S. Peregudov、Andrey F. Mironov
DOI:10.1016/j.tetlet.2008.09.087
日期:2008.12
A highly efficient Lewis acid-catalyzed method for the Nenitzescusynthesis of 5-hydroxyindoles with a range of substituents at N-1 and C-3 and symmetric 5,5′-dihydroxydiindoles has been developed. The amount of the catalyst (10–100 mol %) required depended on the nature of the enaminone component. It has been shown that Lewis acid plays a role in enaminone component activation through an enamine-ZnC12
Enamination of a wide various primary amines was successfully carried out in the presence of catalytic amounts of cerium chloride heptahydrate in ionic liquid and solvent-free conditions as 'green' media under mild reaction conditions.
Novel group IV metal precursors and chemical vapor deposition method using thereof
申请人:SAMSUNG ELECTRONICS CO., LTD.
公开号:EP1184365A3
公开(公告)日:2003-08-06
Disclosed herein is an organometallic precursor of a formula M(L)2 for use in formation of metal oxide thin films, in which M is a group IV metal ion having a charge of +4 and L is a tridentate ligand having a charge of -2, the ligand being represented by the following formula (I): wherein each of R1 and R2, independently, is a linear or branched C1~8 alkyl group; and R3 is a linear or branched C1~8 alkylene group. Also, there is disclosed a chemical vapor deposition method which comprises forming a metal oxide thin film on a substrate using the organometallic precursor. The precursor exhibits excellent volatility, thermal property and hydrolytic stability. The precursor is particularly suitable for the deposition of a multi-component metal oxide thin film containing a group IV metal such as titanium.