- Reactivity of tetraisobutyldialuminum toward water, hydrogen chloride, toluene-3,4-dithiol, pentacarbonylmanganese hydride, and diborane
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The relative reactivities of Al-Al and Al-C bonds, Al2(i-Bu)4, have been examined employing the protonic reagents H3O+, HCl(g), toluene-3,4-dithiol, and HMn(CO)5. Excess H2O, pH 1, results in 100% cleavage of both Al-Al and Al-C bonds, whereas the Al-Al bond exhibits greater reactivity toward HCl(g). In a similar manner the -SH moiety also reacts more readily with the metal-metal bond. In contrast the weak acid HMn(CO)5 is unreactive toward Al2(i-Bu)4. The latter also reacts with a hydride source, B2H6, to afford an insoluble material with the empirical stoichiometry AlB2H4. On the basis of deuterolysis data, the molecular formulation AL2(BH2)4 is suggested with extensive intermolecular hydrogen bonding.
- Miller, Mark A.,Schram, Eugene P.
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- Effect of crystallization water and nature of an aluminum alkyl on the reduction of Eu3+ to Eu2+ in interaction of EuCl 3 ? 6H2O with Bu 3 i Al and Et3Al
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Volumetric and photoluminescence analytical techniques were employed to study the effect of crystallization water and nature of an aluminum alkyl on the reduction of Eu3+ to Eu2+ in a heterophase interaction of EuCl3 ? 6H
- Bulgakov,Kuleshov,Makhmutov
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- Intramolecularly nitrogen-stabilized organoaluminum compounds containing naphthyl, benzyl, and phenyl ligands
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N,N-Dimethylnaphthylamin (1) reacts with Butyllithium to give Li(Et 2O)C10H6NMe2-8 (2). The reaction of 2 with Et2AlCl and EtAlCl2 yields Et2AlC 10H6NMesub
- Schumann, Herbert,Dechert, Sebastian,Hummert, Markus,Lange, Katharina C. H.,Schutte, Stefan,Wassermann, Birgit C.,Koehler, Katrin,Eichhorn, Jens
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- Alkylaluminum-complexed zirconocene hydrides: Identification of hydride-bridged species by NMR spectroscopy
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Reactions of unbridged zirconocene dichlorides, (RnC 5H5-n)2ZrCl2 (n=0, 1, or 2), with diisobutylaluminum hydride (HAI'Bu2) result in the formation of tetranuclear trihydride clusters of the type (RnC5H 5-n)2Zr(μ-H)3(Al iBu2)3(μ-CI) 2, which contain three [Al iBu2] units. Ring-bridged ansa-zirconocene dichlorides, Me2E(RnC5H 4-n)2ZrCl2 with E=C or Si, on the other hand, are found to form binuclear dihydride complexes of the type Me2E(R nC5H4-n)2Zr(CI)(μ-H) 2Al iBu2 with only one [AIBu2] unit. The dichotomy between unbridged and bridged zirconocene derivatives with regard to tetranuclear versus binuclear product formation is proposed to be connected to different degrees of rotational freedom of their C5-ring ligands. Alkylaluminum-complexed zirconocene dihydrides, previously observed in zirconocene-based precatalyst systems activated by methylalumoxane (MAO) upon addition of HAI'Bu2 or Al iBu3, are proposed to be species of the type Me2Si(ind)2Zr(Me)(μ-H) 2Al iBu2, stabilized by interaction of their terminal Me group with a Lewis acidic site of MAO.
- Baldwin, Steven M.,Bereaw, John E.,Brintzinger, Hans H.
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p. 17423 - 17433
(2009/06/08)
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- Activation of alkylidene-bridged heterobimetallic complexes toward electrophilic attack
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Treatment of alkylidene-bridged zirconium-aluminum species with HMPA renders the CAl bond of the alkylidene unit susceptible to electrophilic attack; in the absence of HMPA, the CZr bond is attacked.
- Clift, Susan M.,Schwartz, Jeffrey
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- DARSTELLUNG UND EIGENSCHAFTEN VON L(-)BORNOXY-PHENYL-β-(TRIETHOXYSILYL)ETHYLSULFIDO-ZINNHYDRID
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Phenyltin trichloride reacts with NaSCH2CH2Si(OC2H5)3 and sodium-L(-)borneolate with formation of chloro-β-(triethoxysilyl)ethylsulfidophenylstannyl-L(-)borneolate, which is reduced by diisobutylaluminum hydride to the corresponding chiral organotin hydri
- Schumann, Herbert,Pachaly, Bernd
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p. C75 - C77
(2007/10/02)
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- Process for production of 2,6-dimethyl-1,3,6-octatriene
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A process for producing 2,6-dimethyl-1,3,6-octatriene by dimerizing isoprene in the presence of a novel catalyst composition, which comprises: (A) a zirconium component represented by the formula: Zr(OR)n Cl4-n wherein R is a chlorinated alkyl group containing two to 20 carbon atoms or a chlorinated cycloalkyl group containing three to 20 carbon atoms, and n is an integer of 1 to 4; (B) an aluminum component represented by the formula: AlR'm Cl3-m wherein R' is an alkyl group containing one to 10 carbon atoms, a cycloalkyl group containing three to 10 carbon atoms, or an aryl group, and m is 1.5 or 2; and (C) a coordinating component.
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