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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of Silylborazines and Their Utilization as Precursors to Silicon-Containing Boron Nitride⋆ (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 855-859 
    Details
    ISSN: 1434-1948
    Keywords: Borazines ; Silyl borazines ; Oligomers ; Pyrolysis ; Ceramics ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reactions of LiSi(SiMe3)3 with Cl(Me)2B3N3(Me)3, Cl2(Me)B3N3(Me)3, (ClBNMe)3, and (ClBNH)3 result in the formation of molecular species (Me3Si)3Si(Me)2B3N3(Me)3, [(Me3Si)3Si]2(Me)B3N3(Me)3, [(Me3Si)3SiBNMe]3, and [(Me3-Si)3SiBNH]3. The new compounds have been characterized by spectroscopic techniques, and a single-crystal X-ray diffraction analysis for [(Me3Si)3SiBNMe]3 has been completed. The monomer (Me3Si)3Si(Cl)2B3N3H3 was also prepared and combined with (Me3Si)2NH in hexane to form an organic solvent soluble oligomer. Pyrolysis of this oligomer provides composites containing BN and an SiXNYCZ phase that suppresses the crystallization of BN.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Contributions to the Chemistry of Boron, 205. Formation of Phosphinoborane Rings. A Reinvestigation of the Reaction of [(CH3)3Si]3P with Borane(3) (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 1455-1460 
    Details
    ISSN: 0009-2940
    Keywords: Phosphine-borane adducts ; Phosphinoboranes trimeric ; Spiro boron heterocycles ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Combination of (Me3Si)3P and H3B·THF results in the formation of the known adduct (Me3Si)3P·BH3 (1). The complex undergoes dehydrosilylation above 100°C, and two ring compounds, [(Me3Si)2PBH2]3 (2) and P[(μ—H—B2—H2)]{(BH2)2[P(SiMe3)2]2}2 (3), are isolated. The crystal structures of the compounds are compared with those of other phosphinoboranes.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230702
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  • 3
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, 216. Über die Komplexbildung von 1,3,2,4-Diphosphadiboretanen mit Pentacarbonylchrom sowie über die Darstellung und Reaktivität von Borylidenphosphan-Komplexen (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 875-887 
    Details
    ISSN: 0009-2940
    Keywords: 1,3,2,4-Diphosphadiboretanes, 2,4-bis(dialkylamino)- ; Boranes, (dialkylamino)bis(alkylphosphanyl)- ; Chromium, pentacarbonyl[2,3-bis(dialkylamino)1-1,3,2,4-diphosphadiboretane] complexes ; Chromium, pentacarbonyl[(2,2,6,6-tetramethylpiperidino)phosphane-P]- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Contributions to the Chemistry of Boron, 216[1]. - On the Complex Formation of 1,3,2,4-Diphosphadiboretanes with Pentacarbonylchromium and the Preparation and Reactivity of Borylidenephosphane Complexes2,4-Bis(dialkylamino)1-1,3,2,4-diphosphadiboretanes (R2NBP-CMe3)2 with sterically undemanding amino substituents are prepared together with the corresponding bis(phosphanyl)1-boranes R2NB(PHCMe3)2 by the reaction of R2NBCl2 with Li-P(H)CMe3. Complexes of 1,3,2,4-diphosphadiboretanes with one or two pentacarbonylchromium fragments were obtained by the reaction of the ligands with Cr(CO)5·THF or Cr(CO)5·NMe3. If substituents are sterically demanding, cycloreversion is observed with formation of [(aminoborylidene)1-phosphanyl-P]pentacarbonylchromium compounds tmpB=PR[Cr(CO)5] (10, 29) with an allene-like structure. Complex 29 may also be prepared by HCl elimination from tmp-B(Cl)-P(H)CMe3[Cr(CO)5] (34) with lithium diisopropylamide. This reaction can by reversed be the addition of HCl. The diphosphadiboretane 11 reacts with HCl, ethanol, and secondary amines with cleavage of all BP bonds. The X-ray structures of complexes (Et2NB - PCMe3)2[Cr(CO)5]2 (23) and (iPr2NB - PCEt3)2 [Cr(CO)5] (25) as well as of the diphosphadi-boretanes (Me2NB - PCMe3)2 (11) and (iPr2NB - PCEt3)2 (24) are presented. The intra ring angles of 23 remain almost unchanged upon complexation. In contrast, the B2P2 ring of 25 is slightly folded and its noncoordinated P atom approaches a planar environment.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260405
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  • 4
    Electronic Resource
    Electronic Resource
    Contributions to the Chemistry of Boron, 233Part 232: Ref.[1].. Reactions of a 1,2,3,4-Diphosphadiboretane with Some Carbonylmetal CompoundsDedicated to Professor Kurt Dehnicke on the occasion of his 65th birthday. (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 1233-1241 
    Details
    ISSN: 0009-2940
    Keywords: 1,2,3,4-Diphosphadiboretane-tetracarbonyliron complexes ; 1,3,2,4-Diphosphadiboretane-tetracarbonylchromium complexes ; 1,2,3,4-Diphosphadiboretane, isomerisation of ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,2-Di-tert-butyl-3-(diisopropylamino)-4-(dimethylamino)- 1,2,3,4-diphosphadiboretane (1) reacts with Fe2(CO)9 to give two isomeric tetracarbonyliron complexes 2, 3 with P-Fe bonds and a bis(tetracarbonyliron) complex 4. In contrast, 1 displaces the olefinic ligand from tetracarbonyl(η4-norbornadiene)metal (metal = Cr, Mo) to form the tetracarbonylmetal complexes 5 and 6 with a rearranged ligand molecule, i.e. a 1,3,2,4-diphosphadiboretane. This process is accompanied by a change of the tert-butyl groups from an anti orientation in 1 to a syn orientation in 5 as shown by X-ray crystallography.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961291015
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  • 5
    Electronic Resource
    Electronic Resource
    Contributions to the Chemistry of Boron, 214. Synthesis and Reaction Chemistry of Aminophosphanylboranes (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 379-397 
    Details
    ISSN: 0009-2940
    Keywords: Boranes, amino-, phosphanyl- ; Diphosphadiboretanes ; Triphosphatriborinanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aminochlorophosphanylboranes, (R2N)B(Cl)P(SiMe3)2 (1a  -  d) and (R2N)B(Cl)PH2 (2a  -  d), are obtained from elimination reactions between aminochloroboranes and LiP(SiMe3)2 and LiPH2, respectively. Selected reaction chemistry of (i1-Pr2N)B(Cl)P(SiMe3)2] (1a) with NH3, Me3SiN3, Cr(CO)5 · NMe3, and W(CO)5 · NMe3 is described. The azide (i1-Pr2N)B(N3)P(SiMe3)2 (12a) is stable at 25°C; however, thermolysis at 80°C provides a novel six-membered ring compound [(i1-Pr2N)BN(SiMe3)P(SiMe3)]2 (13a). The reaction of (Ph2N)B(Cl)P(SiMe3)2 (1b) with LiP(SiMe3)2 produces the only isolable bis(phosphanyl)borane (5b), while combination of (R2N)B(Cl)Ph2 with LiPH2 · DME yields new diphosphadiboretanes 6 {(R2N)BPH}2 (R2N=i1-Pr2N, Ph2N and tmp=2,2,6,6-tetramethylpiperidino) and triphosphatriborinanes 7 {(R2N)BPH}3 (R2N=(Me3Si)2N, Me2N and Et2N). Two salts, [(i1-Pr2N) DME]2 (8a) and [tmpLi · DME]2 (8c) (DME=ethylene glycol dimethyl ether) are also isolated. The results of molecular structure determinations for [(i1-Pr2N)Bn(SiMe3)P(SiMe3)]2 (13a), [tmpBPH]2 (4c), [tmpBPH]2 · Cr(CO)5 (7c), {[(Me3Si)2N]BPH}3 (4d), {[(Me3Si)2N]BPH}3 · Cr(CO)5 (7d), (Ph2N)B[P(SiMe3)2]2 (5b), and [(i1-Pr2N) · DME]2 (8a) are discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260215
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis and Structure of a Silyl-aminoalane Ring (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 2649-2651 
    Details
    ISSN: 0009-2940
    Keywords: Alane, amino- ; Aluminium nitride ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reactions of hydrazine with tris(trimethylsilyl)aluminium-ether have been studied: Reactant ratios of 0.5:1 and 0.8:1 produce the cyclic aminoalane [(Me3Si)2AlN(H)(SiMe3)]2 (1), which is formed by N-N bond cleavage and silyl group migration from aluminium to nitrogen. Pyrolysis under NH3 of a polymeric product formed from a 1:1 reaction produces an AlN/Si3N4 composite.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931261213
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  • 7
    Electronic Resource
    Electronic Resource
    Reactions of Monomeric Phosphanylboranes with Acyl Chlorides: 1-Oxa-3-oxonia-5-phospha-2-borata-3,5-cyclohexadienes (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1923-1926 
    Details
    ISSN: 0009-2940
    Keywords: 1-Oxa-3-oxonia-5λD3-phospha-2-boratacyclohexadiene derivatives ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Monomeric B-[bis(trimethylsilyl)phosphanyl]-9-borabicyclo-[3.3.1]nonane (1) reacts with acyl chlorides 2 in a 1:2 ratio to afford deep red derivatives of six-membered oxaoxonia-s̰2,λD3-phosphaboratacyclohexadienes 3. In contrast, the (di-tert-butylboryloxy)phosphaethene 5 is obtained from tBu2BP-(SiMe3)2 (4) and PhC(O)Cl. It is assumed that both reactions proceed via a common intermediate, an (acylphosphanyl)bo-rane 6. The color of compounds 3, which feature a flat boat conformation, is due to a π-π* transition.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941271016
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  • 8
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, 170. Synthese und Struktur eines 1,3,2,4-Diphosphadiboretans (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 2681-2685 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Contributions to the Chemistry of Boron, 170. Synthesis and Structure of a 1,3,2,4-DiphosphadiboretaneDehydrohalogenation of chloro[(1,1-diethylpropyl)phosphino](2,2,6,6-tetramethylpiperidino)borane (1) produces no compound with a PB double bond but its diphosphadiboretane dimer 3, whose crystal structure has been determined. The molecule has a crystallographic center of symmetry. Its BP bond lengths (1.916, 1.933 Å) are comparatively long, suggesting weak BP bonds.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19861190825
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  • 9
    Electronic Resource
    Electronic Resource
    Contributions to the chemistry of boron, 188. Synthesis and Structures of New 1,3,2,4-Diphosphadiboretanes (1988)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 871-879 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Beiträge zur Chemie des Bors, 188.  -  Synthese und Strukturen Neuer 1,3,2,4-DiphosphadiboretaneDrei Methoden wurden zur Darstellung neuer Diphosphadiboretane entwickelt: a) Die baseninduzierte Elimierung von Halogenwasserstoff aus (Amino)phosphinobor-halogeniden, b) Tris-(trimethylsilyl)phosphan-Abspaltung aus R2N—B[P(SiMe3)2]2-Zwischenprodukten und c) Organylphosphan-Eliminierung aus Aminobis(organylphosphino)boranen R2N—B(PHR′)2. Die Molekülstrukturen von drei neuen 1,3,2,4-Diphosphadiboretanen (3, 4a, 4c) wurden mittels Röntgenbeugung bestimmt. Sie sind durch planare B2P2-Ringe charakterisiert. Die P-Substituenten stehen trans zueinander. Experimentelle Ergebnisse werden mit MNDO III Rechnungen verglichen; letztere ergeben eine geringe Aktivierungsbarriere (ΔE = 5 kcal/mol) für die Dimerisierung von H2N—B=PMe zu (H2N—BPMe)2.
    Notes: Three methods have been devised to prepare new diphosphadiboretanes: a) Base-induced hydrogen halide elimination from (amino)phosphinoboron halides precursors, b) tris(trimethylsilyl)-phosphane elimination from R2N—B[P(SiMe3)2]2 intermediates prepared in situ from combinations of R2N—B(Cl)—P(SiMe3)2 and LiP(SiMe3)2, and c) organylphosphane elimination from aminobis(organylphosphino)boranes R2N—-B(PHR′)2. The molecular structures of three new 1,3,2,4-diphosphadiboretanes (3, 4a, 4c) were determined by X-ray diffractometry. These are characterized by a planar four-membered B2P2 ring with the phosphorus substituents in trans positions. Their BP bonds represent single bond distances. Experimental results are compared with MNDO III calculations which reveal a low barrier (ΔE = 5 kcal/mol) for the dimerization of the boraphosphene H2N—B=PMe to the diphosphadiboretane (H2N—BPMe)2.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19881210510
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  • 10
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, 196. Darstellung und Reaktionen eines 3-Amino-1,2,3-azaphosphaboriridins (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 423-426 
    Details
    ISSN: 0009-2940
    Keywords: 1,2,3-Azaphosphaboriridine, 3-amino- ; Chromium complex, (3-amino-1,2,3-azaphosphaboriridine-P)- ; 1,3,2,4-Thiazaphosphaboretidine-2-sulfide derivative ; Tungsten complex, (3-amino-1,2,3-azaphosphaboriridine-P)- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Boron, 196. - Preparation and Reaction of a 3-Amino-1,2,3-azaphosphaboriridineThe 1,2,3-azaphosphaboriridine 7, obtained by dehalogenation of the boryl(phosphino)amine precursor 6, reacts with sulfur or selenium not only with ring expansion but also with oxidation of its λ3-P atom to form the new heterocycles 8. The M(CO)5 fragments generated photolytically from Cr(CO)6 and W(CO)6, respectively, add to the P atom of 7. In contrast, MeI does not produce the phosphonium salt derived from 7. Rather the RP fragment is removed as iPr(Me)PI with formation of the iminoborane tmp-iPr.
    Notes: Das 1,2,3-Azaphosphaboriridin 7, dargestellt durch Enthalogenieren der Boryl(phosphino)amin-Vorstufe 6, reagiert mit Schwefel und Selen nicht nur unter Ringerweiterung, sondern zugleich unter Oxidation des λ3-Phosphors zu den neuen Heterocyclen 8. Während sich die aus Cr(CO)6 und W(CO)6 unter Photolyse erzeugten Pentacarbonylfragmente M(CO)5 an das P-Atom von 7 addieren, erhält man mit MeI kein Phosphoniumsalz. Vielmehr wird das RP-Fragment von 7 unter Bildung des Iminoborans tmp-tBu als iPr(Me)PI abgespalten.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891220305
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