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  • American Society of Hematology  (163)
  • Wiley-Blackwell  (84)
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  • 1
    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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  • 2
    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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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Effect of crosslinker on properties of copolymeric N-vinyl-2-pyrrolidone/methyl methacrylate hydrogels and organogels (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 331-343 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The γ-ray initiated copolymerisation of N-vinyl-2-pyrrolidone with methyl methacrylate in the presence of crosslinker has been effected to high conversion. At two fixed compositions of the principal monomers, the inclusion of different concentrations of the tetrafunctional crosslinkers ethylene dimethacrylate and a low molar mass poly(ethylene glycol) dimethacrylate produced crosslinked xerogels, which were subsequently swollen in water and 1,4-dioxane to yield hydrogels and organogels, respectively. These gels were characterised by determinations of sol fraction, equilibrium solvent content and uniaxial compression stress/strain measurements. Differences among the swelling and mechanical properties according to the nature and concentration of crosslinking agent and according to the nature of the swelling medium are noted and discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910207
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  • 8
    Electronic Resource
    Electronic Resource
    Observations on the swelling behaviour of copolymeric hydrogels containing N-vinyl-2-pyrrolidone (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 321-330 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polymer-water interaction parameters, sequence length distributions and contents of total, freezing and non-freezing water have been discussed for a family of hydrogels. The xerogel precursors contained N-vinyl-2-pyrrolidone (VP) with several co-monomers of different levels of hydrophobicity present in the xerogel over a wide range of composition. Common trends in the behaviour of these systems have been noted and rationalised. In particular the findings indicate that (i) in the poly-VP hydrogel ther are ca. 8-10 molecules of non-freezing water per VP unit and (ii) in the copolymeric hydrogels the maximum occurring in the variation of mole fraction of VP versus mole fraction of water is due substantially to the sharp increase in uptake of freezing (or bulk) water by copolymers rich in VP.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910206
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  • 9
    Electronic Resource
    Electronic Resource
    LU decomposition of matrices with augmented dense constraints (1987)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 24 (1987), S. 1451-1459 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Sparse matrices composed of a central band and augmented dense rows and columns are becoming prevalent in the numerical solution of a large class of boundary and initial-value problems. A Fortran Subroutine ARROW is presented for the LU decomposition and solution of linear equation systems with such a structure. The computational speed of the program is compared in MFLOPS (millions of floating point operations per second) to the LINPACK benchmark for the solution of a dense linear system and is found to be of comparable speed on both supercomputers and minicomputers. Use of the Basic Linear Algebra Subroutines (BLAS) available on most machines significantly enhances the speed of ARROW.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620240804
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  • 10
    Electronic Resource
    Electronic Resource
    Photokatalytische Systeme. XLVIIIXLVII. Mitt.: H. HENNIG, P. SCHEIBLER, R. WAGENER u. D. REHOREK, Z. Chem., im Druck.. Ungewöhnliche lichtinduzierte Redoxreaktionen von Cobalt(III)-, Eisen(III)- und Kupfer(II)-Komplexverbindungen in Gegenwart von ChromsäureesternHerrn Prof. Dr. Dr. h. c. H. G. O. Becker zum 60. Geburtstag gewidmet (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 279-291 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Photocatalytic Systems. XLVIII. Unusual Light-Induced Redox Reactions of Cobalt(III), Iron(III) and Copper(II) Complexes in Presence of Chromic Acid EstersThe coordination compounds[Co(NH3)5H2O]3+,[Co(NH3)4(H2O)2]3+,[Co(en)2(H2O)Cl]2+ (en = ethylendiamine), [L2(H2O)Fe-O-Fe(H2O)L2]4+ (L = 1,10-phenanthroline; 2,2′-bipyridine) and [CuL2]2+ (L = 2,9-dimethyl-1,10-phenanthroline) show no or neglegible photo redox reactions upon irradiation wave-length above 350 nm. However, in the presence of chromate(VI), water, and different alcohols like methanol, ethanol, i-propanol and n-propanol a very efficient light-induced formation of cobalt(II), iron(II) and copper(I) (φ = 0,7; Λirr = 375 nm) can be observed together with reduced generation of chromium(III). The participation of chromium(V) in the primary step of the photolysis of chromic acid esters was shown to be the reason for these unusual light-induced redox reactions. The coordination compounds under discussion behave as very efficient scavengers for chromium(V) connected with simultaneous reoxidation to chromate(VI) and reduction to the appropriate cobalt(II), iron(II) and copper(I) compounds. The general importance of the participation of chromium(V) in the primary step of the photolysis of chromate(VI) in non-aqueous solvents is also shown by investigations of the photochemical behaviour of the system metal complex/CrO4 - , Cr2O7 - /dimethylsulfoxide. Possible mechanisms of the light-induced reductions of the metal complexes are discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19823240212
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