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  • 1
    Electronic Resource
    Electronic Resource
    Dinuclear Diphosphine-Bridged Complexes of Rhodium, Iridium, and Ruthenium: Synthesis and Structure (1994)
    s.l. : American Chemical Society
    Organometallics 13 (1994), S. 3085-3094 
    Details
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/om00020a025
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  • 2
    Electronic Resource
    Electronic Resource
    Borabenzene derivatives. 20. (Boratabenzene)(hexamethylbenzene)iron complexes: synthesis, structure, and reactivity (1993)
    s.l. : American Chemical Society
    Organometallics 12 (1993), S. 2660-2667 
    Details
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/om00031a040
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  • 3
    Electronic Resource
    Electronic Resource
    Two-dimensional deuterium magic-angle-spinning nuclear magnetic resonance of paramagnetic compounds: Separation of paramagnetic and quadrupole interactions (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 5393-5405 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A new two-dimensional 2H magic-angle-spinning NMR experiment to study paramagnetic compounds is presented. It can be carried out by the two-pulse sequence (90°)–(t1)–(180°)–(t2, acquisition) or the three-pulse sequence (90°)–(t1)–(54.7°)–(τ)–(125.3°)–(t2, acquisition). The latter has the advantages over the former in that pure-absorption spectra can be obtained, and also finite pulse-width effects are less apparent. The intensities of the two-dimensionally spread sidebands are calculated as a function of the paramagnetic and the quadrupole coupling parameters, the time-evolution of the spin system during the rf pulse being involved. The method is applied to paramagnetic coordination compounds with selectively deuterated acetate groups: Mn2O(O2CCD3)2{(C3H3N2)2BH}2 and Pr(O2CCD3)3⋅H2O. The principal values of the two interaction tensors can be separately estimated from the projections of the two-dimensional spectrum onto the corresponding diagonals. These values are further refined by simulations of the two-dimensional spinning sideband pattern, which also allows us to determine the mutual orientation of the two tensors. The paramagnetic shift tensors are calculated on the basis of the crystal structures and are compared with those obtained by the experiments. The effect of the bulk magnetic susceptibility on the observed paramagnetic shift tensor is discussed. Some methods to remove this effect are suggested. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473565
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Bildung eines Fe2(CO)6-Komplexes mit (Boryloxy)allyl-Brücke (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 91-92 
    Details
    ISSN: 0009-2940
    Keywords: Boranes, amino(imino) ; Iron, tricarbonyl(butanone) ; Diiron, [(boryloxy)allyl]hexacarbonyl ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Formation of a Fe2(CO)6 Complex with a (Boryloxy)allyl BridgeThe amino(imino)borane Me3Si(tBu)N=B=NtBu (1) reacts with (benzylideneacetone)tricarbonyliron (2) in 1:2 molar ratio to give a 50% yield of the hexacarbonyldiiron complex 3 with a fly-over (boryloxy)allyl bridge, which crystallizes in the space group P21/c. The structure of 3 can be described as a pyramid with Fe(CO)3 at the apex and a non-planar pentagon [-Fe(CO)3-O(BXX′)-C(Me)-CH-C(Ph)-] [X = NHtBu, X′ = N(SiMe3)tBu] as the basis, but there is no bond between the apex and the O atom.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270114
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis and Structure of the New α-Aminosilanolate [LiOSiMe2(NMe2)]6 (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1619-1620 
    Details
    ISSN: 0009-2940
    Keywords: Silanolate ; Aminosilanolate ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Lithium (dimethylamino)dimethylsilanolate (1) is obtained from trimeric dimethylsiloxane and lithium dimethylamide in quantitative yield. In the crystal 1 is a hexamer [LiOSiMe2(NMe2)]6 with crystallograpic C3i (S6, 3) symmetry. The molecule of 1 consists of a hexagonal prismatic (LiO)6 core and an N,O-chelating anion.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270912
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  • 6
    Electronic Resource
    Electronic Resource
    Weitere Reaktionen des Amino(imino)borans Me3Si(tBu)N*B*NtBu und des Alkyliden(amino)borans Me3Si(tBu)N=B=CHtBu (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 1565-1569 
    Details
    ISSN: 0009-2940
    Keywords: Boranes, amino(imino)- ; Boranes, alkylidene(amino)- ; Tantalum, alkylidene complexes ; Azadiboracyclobutanes ; [2 + 2] Cycloadditions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Further Reactions of the Amino(imino)borane Me3Si(tBu)N*B*NtBu and the Alkylidene(amino)borane Me3Si(tBu)-N=B=CHtBuThe alkylidenetantalum complexes [tBuHC=TaCl3(THF)2] (1b), [PhHC=TaCl3(PMe3)2] (1c), and [tBuHC=Ta(CH2tBu)3] (1d) were treated with the amino(imino)borane Me3Si(t-Bu)N*B*NtBu (2d). From 1b and 2d, the alkylidene(amino)borane Me3Si(tBu)N=B=CHtBu (7) is formed by metathesis. The 1:2 reaction of 1c with 2d gives the azadiboracyclobutane [-N(tBu)-B(X)-CHPh-B(X)-] [6d, X=Me3Si(tBu)N]. The six-membered ring compound [-N(tBu)=BR-N(tBu)-SiMe2-CH2-TaR(CHtBu)-] (8, R=CH2tBu) is obtained from 1d and 2d; the product 8 crystallizes in the space group P 21/c. The borane 7 is attacked at the BC double bond by Et2NH, tBuCHO, and Me3SiN3 giving the diamino(neopentyl)borane 9 by protolysis, the oxaboracyclobutane 10 by [2 + 2] cycloaddition, and the azaboracyclopropane 11 by cycloaddition and elimination of N2, respectively.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260710
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  • 7
    Electronic Resource
    Electronic Resource
    3-Borolene mit diastereotopen Seiten: Synthese von 4-(Dialkylamino)-4-boratricyclo[5.2.1.02,6]dec-2(6)-enen und Struktur des Dimethylamino-Derivats (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1401-1404 
    Details
    ISSN: 0009-2940
    Keywords: 1H-Borole, 2,5-dihydro- ; 4-Boratricyclo[5.2.1.02,6]dec-2(6)-ene ; Bicyclo[2.2.1]heptane, 2,3-dimethylene- ; Bicyclo[2.2.1]heptane, 3-methyl-2-methylene- ; Bicyclo[2.2.1]hept-2-ene, 2,3-dimethyl- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 3-Borolenes with Diastereotopic Faces: Synthesis of 4-(Dialkylamino)-4-boratricyclo[5.2.1.02,6]dec-2(6)-enes and Structure of the Dimethylamino DerivativeTwo syntheses of 2,5-dihyro-1H-borole derivatives with diastereotopic faces are described. 2,3-Dimethylenenorbornane (2) is transformed into the zirconocene complex 5 (≡ Cp2Zr · 2) in a large-scale preparation; 5 reacts with dichloro-(dialkylamino)boranes BCl2(NR2) to give 4-(dialkylamino)-4-boratricyclo[5.2.1.02,6]dec-2(6)-enes 1 (R = Me, iPr). Alternatively, 2,3-dimethylnorbornene (santene) (3) or 3-methyl-2-methylenenorbornane (4) can be kaliated by means of Lochmann-Schlosser base to give a dimetallation product 6 (≡ K2 2); treatment of 6 with BCl2(NR2) also affords the boratricycles 1 (R = Et, iPr). The structure of the dimethylamino derivative 1a has been determined by X-ray diffraction.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270813
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  • 8
    Electronic Resource
    Electronic Resource
    Optically Active Titanium Complexes Containing Linked Amido-cyclopentadienyl Ligands: Their Use as Asymmetric Hydrogenation Catalysts (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 1429-1431 
    Details
    ISSN: 0009-2940
    Keywords: Titanium complexes ; Amido-cyclopentadienyl ligand ; Optically active complexes ; Asymmetric hydrogenation catalysts ; Conformational rigidity ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Optically active titanium complexes of the formula Ti(η5:η1-C5R4SiMe2NCHMePh)Cl2 (R = H, Me), containing the cyclopentadienyl ligand linked to a chiral 1-phenylethylamido moiety, were synthesized and characterized in both enantiomerically pure forms. A single-crystal X-ray structural analysis of (S)—(—)Ti(η5:η1-C5H4SiMe2NCHMePh)Cl2 shows a conformation in which the phenyl group is turned away from the metal center. NOE measurements suggest that a related structure is retained in solution. Upon activation with n-butyllithium, these complexes show hydrogenation activity toward imines with slight enantioselectivity.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961291205
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  • 9
    Electronic Resource
    Electronic Resource
    Linked Benzylamido-Cyclopentadienyl Ligands: Synthesis and Characterization of Alkyl Titanium Complexes (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 209-215 
    Details
    ISSN: 0009-2940
    Keywords: Titanium ; Amidocyclopentadienyl ligand ; Alkyltitanium compounds ; Lewis acids ; Agostic interactions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Titanium complexes of the general type Ti(η5:η1-C5H4Si-Me2NCH2C6H3X2-2,5)Cl2 (X=H, F), containing a linked benzylamido-cyclopentadienyl ligand, were prepared by reaction of Ti(η5-C5H4SiMe2Cl)Cl3 with lithium amide Li(NHCH2C6H3X2-2,5). A single-crystal X-ray structural analysis of Ti(η5: η1-C5H4SiME2NCH2C6H3F2-2,5)Cl2 revealed a conformation in the solid state in which the aryl ring is turned away from the metal center. Ti(η5:η1-C5H4SiMe2NCH2C6H5)Cl2 can be alkylated with a variety of reagents to form extremely sensitive complexes of the type Ti(η5-C5H4SiMe,2NCH2C6H5)R2 (R=Me, CH2 C6H5, CH2SiME3, CH2CMe2C6H5). Reaction of Li2[C5Me4SiMe2NCH2C6H5] with TiCl3(THF)3 gave Ti(η5: η1-C5Me4SiMe2NCH2C6H5)Cl2, which can also be alkylated to form dialkyl complexes of the type Ti(η5:η1-C5Me4SiMe2NCH2C6H5)R2(R=Me, CH2C6H5, CH2SiMe3, C6H5).A single-crystal X-ray structural analysis of Ti(η5:η1-C5Me4SiMe2NCH2C6H5)(CH2C6H5)2 suggests the presence of α-agostic bonding of one of the titanium-bound CH2C6H5 groups to the titanium center.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971300211
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  • 10
    Electronic Resource
    Electronic Resource
    Titanium Complexes with a Linked Amido-Cyclopentadienyl Ligand and a Bidentate Organyl Group: Synthesis, Structure, and Ethene Polymerization Activity (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 237-244 
    Details
    ISSN: 1434-1948
    Keywords: Titanium complexes ; Amido-cyclopentadienyl ligand ; Titanium alkyl ; Intramolecular coordination ; Ethene polymerization ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Titanium complexes containing a linked isopropyl- or benzylamido(tetramethylcyclopentadienyl) ligand C5Me4SiMe2NR (R = iPr, CH2Ph,) and one bidentate organyl group C6H4(CH2NMe2)-2, CH2C6H4(NMe2)-2, and {η5-C5H3(CH2NMe2)-2}Fe(η5-C5H5) were prepared by salt metathesis of the corresponding dichloro complex Ti(η5:η1-C5Me4SiMe2NR)Cl2 with the lithium organyl. Single crystal X-ray structural analysis of Ti(η5:η1-C5Me4SiMe2NCH2Ph)- {C6H4(CH2NMe2)-2}Cl and of Ti(η5:η1-C5Me4SiMe2NiPr){CH2C6H4(NMe2)-2}Cl revealed the presence of intramolecular coordination with square pyramidal geometry around titanium. In the ferrocenyl derivative Ti(η5:η1-C5Me4SiMe2NCH2Ph)[{η5-C5H3(CH2NMe2)-2}Fe(η5-C5H5)]Cl the NMe2 group is not bonded at the titanium atom. Ethene polymerization catalyzed by these complexes upon activation with methylaluminoxane was examined.
    Type of Medium: Electronic Resource
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