Search Results - "Hessen, Bart"

Lanthanum Tribenzyl Complexes as Convenient Starting Materials for Organolanthanum Chemistry by Bambirra, Sergio, Meetsma, Auke, Hessen, Bart

“…Simple tribenzyl complexes of lanthanum, [La(CH2C6H4-4-R)3(THF)3] (R = H (1a), Me (1b)), were prepared in a remarkably straightforward fashion from LaBr3(THF)4…”
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Palladium-Catalyzed Enantioselective Conjugate Addition of Arylboronic Acids by Gini, Francesca, Hessen, Bart, Minnaard, Adriaan J

“…The first asymmetric palladium-catalyzed conjugate addition of arylboronic acids to α,β-unsaturated aldehydes, ketones, and esters is described. For cyclic…”
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One Ligand Fits All:  Cationic Mono(amidinate) Alkyl Catalysts over the Full Size Range of the Group 3 and Lanthanide Metals by Bambirra, Sergio, Bouwkamp, Marco W, Meetsma, Auke, Hessen, Bart

“…Using a sterically demanding amidinate ancillary ligand and an in situ alkylation procedure, neutral mono(amidinate) dialkyl and cationic mono(amidinate)…”
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Versatile Coordination of Cyclopentadienyl-Arene Ligands and Its Role in Titanium-Catalyzed Ethylene Trimerization by Otten, Edwin, Batinas, Aurora A, Meetsma, Auke, Hessen, Bart

“…Cationic titanium(IV) complexes with ansa-(η5-cyclopentadienyl,η6-arene) ligands were synthesized and characterized by X-ray crystallography. The strength of…”
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Electronic Selectivity Tuning in Titanium(III)-Catalyzed Acetylene Cross-Dimerization Reactions by Oshovsky, Gennady V, Hessen, Bart, Reek, Joost N. H, Bruin, Bas de

“…The reactivity of open-shell titanium­(III) complexes in organometallic catalysis is associated with many open questions, in particular regarding the…”
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Synthesis and Structures of Scandium and Lutetium Benzyl Complexes by Meyer, Nils, Roesky, Peter W, Bambirra, Sergio, Meetsma, Auke, Hessen, Bart, Saliu, Kuburat, Takats, Josef

“…Scandium and lutetium benzyl complexes were prepared. Reaction of [ScCl3(THF)3] with potassium benzyl afforded [Sc(CH2Ph)3(THF)3] (1). In the solid state the…”
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Highly active/selective and adjustable zirconium polymerization catalysts stabilized by aminopyridinato ligands by Kretschmer, Winfried P., Hessen, Bart, Noor, Awal, Scott, Natalie M., Kempe, Rhett

“…Sterically very demanding aminopyridinato ligands stabilize thermally robust, highly active and selective zirconium ethylene polymerization catalysts. Small…”
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Neutral and Cationic Alkyl and Alkynyl Complexes of Lanthanum:  Synthesis, Stability, and Cis-Selective Linear Alkyne Dimerization by Tazelaar, Cornelis G. J, Bambirra, Sergio, van Leusen, Daan, Meetsma, Auke, Hessen, Bart, Teuben, Jan H

“…Neutral triazacyclononane−amide lanthanum dialkyl and dialkynyl complexes were synthesized and structurally characterized. A cationic triazacyclononane−amide…”
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Application of Monodentate Secondary Phosphine Oxides, a New Class of Chiral Ligands, in Ir(I)-Catalyzed Asymmetric Imine Hydrogenation by Jiang, Xiao-bin, Minnaard, Adriaan J, Hessen, Bart, Feringa, Ben L, Duchateau, Alexander L. L, Andrien, Jean G. O, Boogers, Jeroen A. F, de Vries, Johannes G

“…Secondary phosphine oxides were prepared from R1PCl2 and R2MgBr, followed by hydrolysis. They were obtained in an enantiopure form by preparative chiral HPLC…”
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Thermolysis of Half-Sandwich Vanadium(V) Imido Complexes to Generate Vanadium(III) Imido Species via a Vanadium(IV) Intermediate by Batinas, Aurora A, Dam, Jeroen, Meetsma, Auke, Hessen, Bart, Bouwkamp, Marco W

“…Thermolysis of half-sandwich vanadium imido complexes Cp(RN)V(i-Pr2N)Me (R = p-Tol, 1a; R = t-Bu, 1b) results in a mixture of products, including vanadium(IV)…”
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1,1‘-Diisocyanoferrocene and a Convenient Synthesis of Ferrocenylamine by van Leusen, Daan, Hessen, Bart

“…The new ferrocene derivative 1,1‘-diisocyanoferrocene was prepared in 50% isolated yield from the reaction of 1,1‘-diisocyanatoferrocene with formic acid…”
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Highly enantioselective rhodium-catalyzed conjugate addition of arylboronic acids to enones at room temperature by Martina, Sébastien L.X., Minnaard, Adriaan J., Hessen, Bart, Feringa, Ben L.

“…The rhodium–phosphoramidite-catalyzed asymmetric conjugate addition of arylboronic acids to enones proceeds at room temperature using [Rh(OH)(cod)] 2 or…”
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Mono(amidinate) Yttrium Alkyl Complexes: The Effect of Ligand Variation on Ethene Polymerization Catalysis by Bambirra, Sergio, Otten, Edwin, van Leusen, Daan, Meetsma, Auke, Hessen, Bart

“…Yttrium dialkyl complexes were prepared for three different 2,6‐diisopropylphenyl‐substituted benzamidinate ligands. The electron‐donating ability of the…”
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Relative Reactivity of the Metal−Amido versus Metal−Imido Bond in Linked Cp-Amido and Half-Sandwich Complexes of Vanadium by Bouwkamp, Marco W, Batinas, Aurora A, Witte, Peter T, Hubregtse, Ton, Dam, Jeroen, Meetsma, Auke, Teuben, Jan H, Hessen, Bart

“…Treatment of (η5-C5H4C2H4NR)V(N-t-Bu)Me (R = Me, i-Pr) and CpV(N-p-Tol)(N-i-Pr2)Me (Cp = η5-C5H5) with B(C6F5)3 or [Ph3C][B(C6F5)4] results in formation of the…”
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Thiophene C−H Activation as a Chain-Transfer Mechanism in Ethylene Polymerization:  Catalytic Formation of Thienyl-Capped Polyethylene by Ringelberg, Stéphanie N, Meetsma, Auke, Hessen, Bart, Teuben, Jan H

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Synthesis, Structure, and Reactivity of Rare-Earth Metallocene η3-Propargyl/Allenyl Complexes by Quiroga Norambuena, Victor F, Heeres, André, Heeres, Hero J, Meetsma, Auke, Teuben, Jan H, Hessen, Bart

“…The reaction of the alkyl complexes Cp*2LnCH(SiMe3)2 (Ln = Y 1-Y, Ce 1-Ce, La 1-La; Cp* = η5-C5Me5) and Me2Si(η5-C5Me4)2LnCH(SiMe3)2 (Ln = Ce 5-Ce) with…”
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Highly Efficient Hydrosilylation of Alkenes by Organoyttrium Catalysts with Sterically Demanding Amidinate and Guanidinate Ligands by Ge, Shaozhong, Meetsma, Auke, Hessen, Bart

“…The sterically demanding guanidine ArNHC(NMe2)NAr (Ar = 2,6-diisopropylphenyl, HL) reacts with Y(CH2SiMe3)3(THF)2 to give the yttrium dialkyl complex…”
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Scandium, Yttrium, and Lanthanum Benzyl and Alkynyl Complexes with the N-(2-Pyrrolidin-1-ylethyl)-1,4-diazepan-6-amido Ligand: Synthesis, Characterization, and Z-Selective Catalytic Linear Dimerization of Phenylacetylenes by Ge, Shaozhong, Meetsma, Auke, Hessen, Bart

“…1,4,6-Trimethyl-N-(2-pyrrolidin-1-ylethyl)-1,4-diazepan-6-amine (HL) reacts with M(CH2Ph)3(THF)3 to give the dibenzyl complexes (L)M(CH2Ph)2 (M = Sc, 1; M = Y,…”
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Pentamethylcyclopentadienyl Zirconium and Hafnium Polyhydride Complexes:  Synthesis, Structure, and Reactivity by Visser, Cindy, van den Hende, Johannes R, Meetsma, Auke, Hessen, Bart, Teuben, Jan H

“…The half-sandwich zirconium and hafnium N,N-dimethylaminopropyl complexes Cp*M[(CH2)3NMe2]Cl2 (Cp* = η5-C5Me5, M = Zr, 1; Hf, 2) and Cp*M[(CH2)3NMe2]2Cl (M =…”
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Reversible Chain Transfer between Organoyttrium Cations and Aluminum: Synthesis of Aluminum-Terminated Polyethylene with Extremely Narrow Molecular-Weight Distribution by Kretschmer, Winfried P., Meetsma, Auke, Hessen, Bart, Schmalz, Thomas, Qayyum, Sadaf, Kempe, Rhett

“…Aminopyridinato‐ligand‐stabilized organoyttrium cations are accessible in very good yield through alkane elimination from trialkyl yttrium complexes with…”
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