A5050823020- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Organometallic Complex Synthesis and Catalysis
- Synthetic Organic Chemistry Methods
- Crystallography and molecular interactions
- Carbon dioxide utilization in catalysis
- Coordination Chemistry and Organometallics
- Synthesis and characterization of novel inorganic/organometallic compounds
- Asymmetric Hydrogenation and Catalysis
- Radioactive element chemistry and processing
- Organoboron and organosilicon chemistry
- biodegradable polymer synthesis and properties
- Catalytic Cross-Coupling Reactions
- Catalytic Alkyne Reactions
- Cyclopropane Reaction Mechanisms
- Asymmetric Synthesis and Catalysis
- Catalytic C–H Functionalization Methods
- Membrane Separation Technologies
- Lanthanide and Transition Metal Complexes
- Polyoxometalates: Synthesis and Applications
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Chemical Synthesis and Reactions
- Oxidative Organic Chemistry Reactions
- Metal complexes synthesis and properties
- Ferrocene Chemistry and Applications
Technion – Israel Institute of Technology
2015-2024
Guangdong Technion-Israel Institute of Technology
2020-2023
Chulabhorn Research Institute
2020
Ural Federal University
2020
Ural Branch of the Russian Academy of Sciences
2020
Institute of Organic Synthesis
2020
Wuhan University of Technology
2020
Hunan Institute of Science and Technology
2020
Indian Institute of Chemical Technology
2020
Haifa Medical Center
2020
Free-standing PbSe nanocrystals, including quantum wires, multipods, rods, dots, and cubes, were produced in a colloidal solution the presence of alkyl-diamine solvent at 10−117 °C. The morphology nanocrystals was governed by coordinating molecular template mechanism, which further adjusted temperature duration reaction. Crystalline wires with diameters approximately 20 nm lengths 1−5 μm formed lowest temperatures, while rods (with an aspect ratio ∼5) cubes 100−500 edge) elevated temperatures.
Organoactinide complexes of the type Cp*2AcR2 (Ac = Th, U) catalyze intermolecular hydroamination terminal alkynes with aliphatic amines. The regioselectivity products can be tuned by alkyne and metal. Mechanistic studies shows that rate-limiting step is formation an actinide imido complex. For thorium, intermediate has been characterized standard techniques, including X-ray diffraction.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel probe for the cannabinoid receptorWilliam A. Devane, Aviva Breuer, Tzviel Sheskin, Torbjoern U. C. Jaerbe, Moris S. Eisen, and Raphael MechoulamCite this: J. Med. Chem. 1992, 35, 11, 2065–2069Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inissue 1 1992https://pubs.acs.org/doi/10.1021/jm00089a018https://doi.org/10.1021/jm00089a018research-articleACS PublicationsRequest reuse permissionsArticle...
Organoactinide complexes of the type Cp*2AnMe2 (An = Th, U) have been found to be efficient catalysts for hydroamination terminal alkynes with aliphatic primary amines. The chemoselectivity and regioselectivity reactions depend strongly on nature catalyst amine show no major dependence alkyne. reaction amines catalyzed by organouranium produces corresponding imines where alkyne are regioselectively disposed in a syn-regiochemistry, whereas similar organothorium complex besides methyl...
The chiral lithium (−)-trimethylsilylmyrtanyl amide reacts with benzonitrile yielding the benzamidinate ligand ([N-trimethylsilyl][N'-myrtanyl]benzamidinate Li·TMEDA (TMEDA = tetramethylethylenediamine), [N(R*)−C−N]Li. An X-ray study shows that has a distorted tetrahedral environment in which atom is arranged symmetrically between two and TMEDA nitrogen atoms. Equimolar addition of [N(R*)−C−N]Li to TiCl4 THF yields [N(R*)−C−N]TiCl3·THF (1). 1 it an octahedral structure oxygen one chlorine at...
The polymerization of ethylene with titanium complexes bearing one bulky imidazolin-2-iminato ligand (L) in the presence MAO and/or TTPB as cocatalysts have been explored. complex LTiCl3 and its methylated forms were prepared to shed light on nature active species. With some these complexes, best catalytic activity was obtained at an Al:Ti ratio 8.
Unprecedented catalytic reactivity of actinide coordination complexes toward heterocumulenes, such as carbodiimides, isocyanates, and isothiocyanates is reported. The mono(imidazolin-2-iminato) thorium(IV) complex [Th(Im(Dipp) N){N(SiMe3 )2 }3 ] (1) was applied a precatalyst for the addition EH (E=N, P, S) bonds to YCX core (Y=R2 N; X=NR2 , O, isothiocyanates. respective insertion products were obtained in high yields under mild reaction conditions, with 1 displaying tolerance functional...
The catalytic activity of the metallacycle thorium amide [(Me3Si)2N]2Th[κ2–(N,C)–CH2Si(CH3)2N(SiMe3)] (Th1) is presented for selective dihydroboration nitriles (—C≡N) with pinacolborane (HBpin). Using significantly low catalyst loading (0.1 mol %), dihydroborated amines were achieved by hydroboration —C≡N triple bond attached aromatic, aliphatic, and heteroatom backbones high turnover frequency (TOF) as compared to all reported homogeneous metal catalysts in this reaction. In addition,...
The synthesis of the mono(imidazolin-2-iminato) actinide(IV) complexes [(ImRN)An(N{SiMe3)2}3] (3–8) was accomplished by protonolysis reaction between respective imidazolin-2-imine (ImRNH, R = tBu, Mes, Dipp) and actinide metallacycles [{(Me3Si)N}2An{κ2C,N-CH2SiMe2N(SiMe3)}] (1, An U; 2, M Th). thorium uranium were obtained in high yields, their structures established single-crystal X-ray diffraction analysis. 3–8 display short An–N bonds together with large An–N–C angles, indicating strong...
The thorium methyl and hydride complex (C5Me5)2ThMe2 [(C5Me5)2Th(H)(μ-H)]2 catalyzed highly 1,2-regioselective dearomatization of pyridines via a hydroboration process is reported herein. Twelve different kinds meta- para-substituted are applicable to this reaction, giving the corresponding N-boryl-1,2-dihydropyridine products in high yields. Other N-heteroaromatic compounds, such as benzo-fused N-heterocycles, pyrazines, pyrimidines, 1,3,5-triazine, benzothiazole, were also found be...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChiral C1-Symmetric Group 4 Metallocenes as Catalysts for Stereoregular .alpha.-Olefin Polymerization. Metal, Ancillary Ligand, and Counteranion EffectsMichael A. Giardello, Moris S. Eisen, Charlotte L. Stern, Tobin J. MarksCite this: Am. Chem. Soc. 1995, 117, 49, 12114–12129Publication Date (Print):December 1, 1995Publication History Published online1 May 2002Published inissue 1 December...
This communication reports the synthesis and activity of four racemic mixtures bis(benzamidinate) group-4 complexes, cis-[p-R'C6H4C(NR)2]2MX2 (R' = CH3, R SiMe3, M Ti, X Cl (1); R' Zr, (2); H, i-pr, (3); CH3 (4)) as precatalysts for stereoregular polymerization propylene. These complexes catalyze propylene only under pressure in CH2Cl2, producing polypropylene with very large isotacticities (mmmm % ∼95−98), high melting points (140−154 °C).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSupported organoactinide complexes as heterogeneous catalysts. A kinetic and mechanistic study of facile arene hydrogenationMoris S. Eisen Tobin J. MarksCite this: Am. Chem. Soc. 1992, 114, 26, 10358–10368Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 December 1992https://doi.org/10.1021/ja00052a036RIGHTS & PERMISSIONSArticle Views523Altmetric-Citations87LEARN ABOUT THESE METRICSArticle...
Surprising catalytic activities have been found for the actinide complexes Cp*(2)ThMe(2) (1), Th(NEtMe)(4) (2), and Me(2)SiCp''(2)Th(C(4)H(9))(2) (3) toward oxygenated substrates. During dimerization of benzaldehydes to their corresponding esters, 1 2 gave 65 85% yield in 48 h, respectively, while geometry-constrained complex 3 96% 24 h. Exploring effect substituents on benzaldehyde, it has that, general, electron-withdrawing groups facilitate reaction. Kinetic study with reveals that rate...
The use of bis(1,3-di-tert-butylimidazolin-2-iminato) titanium dichloride (1) and dimethyl (2) complexes in the polymerization propylene is presented. were activated using different amounts methylalumoxane (MAO), giving each case a very active catalytic mixture producing polymers with narrow molecular weight distribution (polydispersity = 1.10). cocatalyst triphenylcarbenium (trityl) tetra(pentafluorophenyl)borate totally inhibits reaction, corresponding titanium(III) methyl complex, trityl...
We report herein the actinide-mediated insertion of E–H bonds (E = C, N, P, S) into various heterocumulenes including carbodiimides, isocyanates, and isothiocyanates.
The organoactinide-catalyzed monohydroboration of carbodiimides is reported herein. catalytic reactions proceed under very mild conditions in a highly atom-efficient and selective fashion to afford the corresponding monohydroborated N-borylformamidine products high yields. A plausible mechanism proposed based on stoichiometric kinetic studies.
The unprecedented actinide-catalyzed addition of alcohols to carbodiimides is presented. This represents a rare example thorium-catalyzed transformations an alcoholic substrate and the first uranium complexes showing catalytic reactivity with alcohols. Using thorium amides U[N(SiMe3)2]3 [(Me3Si)2N]2An[κ(2)-(N,C)-CH2Si(CH3)2N(SiMe3)] (An = Th or U), alcohol additions unsaturated carbon-nitrogen bonds are achieved in short reaction times excellent selectivities high yields. Computational...
The synthesis and characterization of benzimidazolin-2-iminato actinide(IV) complexes [(BimR1/R2N)An(N{SiMe3}2)3] (An = U, Th) (1–6) is reported. All were obtained in high yields, their solid state structures established through single-crystal X-ray diffraction analysis. Using 1–6 as precatalysts, the addition mono- bifunctional E–H (E N, P, C, O, S) substrates to various heterocumulenes, including carbodiimides, isocyanates, isothiocyanates, was investigated, affording respective products...