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  • 1
    Electronic Resource
    Electronic Resource
    Contribution to the chemistry of boron. 150. Competition between adduct and cation formation in reactions between diorganylborane derivatives and pyridine or lutidines (1985)
    s.l. : American Chemical Society
    Inorganic chemistry 24 (1985), S. 2532-2539 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00210a014
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and structure of a metallophosphenium-borane(3) complex containing a bridging BH3 group (1986)
    s.l. : American Chemical Society
    Organometallics 5 (1986), S. 380-383 
    Details
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/om00133a031
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation and conformation of (E,E)-1,5-cyclooctadiene (1987)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 109 (1987), S. 1248-1249 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00238a046
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  • 4
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, 159. [2 + 2]-Cycloadditionen von (tert-Butylimino)(2,2,6,6-tetramethylpiperidino)boran mit Kohlenstoffdichalkogeniden (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 3748-3758 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Boron, 159. [2 + 2] Cycloadditions of (tert-Butylimino)(2,2,6,6-tetramethylpiperidino)borane with Carbon Dichalcogenides[2 + 2] Cycloadditions of CO2, COS, CS2, and CSe2 and the aminoiminoborane 1 give access to the azaboretidines 2-5. These decompose thermally or photolytically with formation of (CH3)3C—N =C =E′ (E′ = O, S, Se) and the dimers of the (tetramethylpiperidino)boron chalcogenides 7-9. The X-ray structure analyses of the sulfur containing heterocycles 4 and 8 reveal the presence of planar four-membered rings. The C2N-unit of the tetramethylpiperidino group in 4 approaches a perpendicular arrangement with four-membered ring (interplanar angle 72°), in 8 however, the two planes are twisted to each other by 17° only.
    Notes: CO2, COS, CS2 und CSe2 reagieren mit dem Aminoiminoboran 1 unter [2 + 2]-Cycloaddition zu den Azaboretidinen 2-5. Diese zerfallen thermisch oder photolytisch unter Abspaltung von (CH3)3C—N =C =E′ (E′ = O, S, Se) und Bildung der dimeren (Tetramethyl-piperidino)borchalkogenide 7-9. Die Röntgenstrukturanalyse der schwefelhaltigen Heterocyclen 4 und 8 zeigt planare Vierringe auf. In 4 bildet das C2N-Strukturelement der Tetramethylpiperidino-Gruppe mit der Vierring-Ebene einen Winkel von 72°, in 8 sind die beiden Ebenen dagegen nur um 17° verdrillt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180927
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  • 5
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, 161. Reaktionen protonenaktiver Verbindungen mit (tert-Butylimino)(2,2,6,6-tetramethylpiperidino)boran (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 3759-3770 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Boron, 161. Reactions of Protic Reagents with (tert-Butylimino)(2,2,6,6-tetramethylpiperidino)boraneThe aminoiminoborane 2 adds protic reagents of type HX (X = OH, OR, OCOR, SH, SR, NH2, NHR, NHNR2) across the formal BN triple bond regiospecifically forming (tert-butylamino)(2,2,6,6-tetramethylpiperidino)boranes (3-7, 12, 13, 15, 16a,b, 17-27) which are inert towards ligand redistribution. The relative rates of addition are primarily governed by steric factors (NH3 〉 NH2R 〉 HNR2; HOR 〉 HSR 〉 HNR2). Bulky amines HNR2 will not add to 2. Excess HX (X = OH, OR, OC(O)R) reacts with the boranes formed on 1:1 addition by breaking BN bonds; however, no prediction can be made concerning which BN bond in tmp[(CH3)3CNH]BX will be cleaved.
    Notes: Das Aminoiminoboran 2 addiert protonenaktive Verbindungen HX (X = OH, OR, OCOR, SH, SR, NH2, NHR, NHNR2) regiospezifisch an die formale BN-Dreifachbindung. Dabei entstehen gegen Substituentenaustausch inerte (tert-Butylamino)(2,2,6,6-tetramethylpiperidino)borane (3 - 7, 12, 13, 15, 16a,b, 17 - 27). Die Anlagerungsgeschwindigkeit hängt qualitativ von sterischen Faktoren ab (NH3 〉 NH2R 〉 HNR2; HOR 〉 HSR 〉 HNR2). Bei sterischer Überfrachtung unterbleibt die Anlagerung an 2. Bei HX-Überschuß (X = OH, OR, OC(O)R) reagieren die durch 1:1-Addition entstandenen Borane unter Spaltung von BN-Bindungen, jedoch ist nicht vorhersehbar, welche der beiden BN-Bindungen in tmp[(CH3)3CNH]BX dabei gelöst wird.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180928
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  • 6
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, 146. Über die Reaktion von Tetrazadiborinanen mit Heterokumulenen: Pseudodipolare [2 + 3]-Cycloadditionen (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 483-494 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Boron, 146 Reactions of Tetrazadiborinanes with Heterocumulenes: Pseudodipolar [2 + 3]-CycloadditionsCO2, COS, and CS2 scavenge the 1,3-dipolar unit \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm R'}\mathop {{\rm B - }}\limits^ \oplus {\rm NR - }\mathop {\rm N}\limits^{\rm \Theta } {\rm R} $\end{document} from the tetrazadiborinanes 3. [2 + 3]-Cycloadducts are formed in a pseudodipolar reaction, namely oxadiaza- and thiadiazaborolidines of type 7, 8 and 4. A reaction mechanism is suggested.  -  The thiadiazaborolidine 4b contains a planar five-membered ring according to an X-ray structure determination. Short BN, NN, and CN bond distances suggest a heteroaromatic ring system. High polarity is associated with the thioxo group. In contrast, the oxadiazaborolidinones 8a, b are in an equilibrium with their dimers in solution.
    Notes: CO2, COS und CS2 fangen aus den Tetrazadiborinanen 3e) den 1,3-Dipol \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm R'}\mathop {{\rm B - }}\limits^ \oplus {\rm NR - }\mathop {\rm N}\limits^{\rm \Theta } {\rm R} $\end{document} ab. In einer pseudodipolaren Reaktion bilden sich als [2 + 3]-Cycloaddukte die Oxadiaza- und Thiadiazaborolidine 7, 8 und 4. Ein Reaktionsmechanismus wird diskutiert.  -  Nach Röntgenstrukturanalyse enthält 4b einen planaren Fünfring. Kurze BN-, NN- und CN-Abstände legen ein heteroaromatisches System nahe, wobei der Thioxo-Gruppe eine erhebliche Polarität zuzuweisen ist. Die Oxadiazaborolidinone 8a, b stehen in Lösung im Gleichgewicht mit ihrem Dimeren.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180210
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  • 7
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, 162. Zur Reaktion von Chlorwasserstoff mit (tert-Butylimino)-(tetramethylpiperidino)boran und seinem Diazadiboretidin-Dimeren (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 4716-4724 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Boron, 162. The Reaction of Hydrogen Chloride with (tert-Butylimino)(tetramethylpiperidino)borane and its Diazadiboretidine DimerHydrogen chloride adds to the amino-imino-borane 1 to give tmpB(Cl)NHC(CH3)3 (3) (tmp = 2,2,6,6-tetramethylpiperidino group), which is also the first product to be isolated in the reaction of HCl with [tmp-B = NC(CH3)3]2 (2). Further interaction leads to the salt tmpHBC[NH-C(CH3)3]Cl (7c), which reacts with HCl to finally yield [tmpH2]Cl. Aminolysis of tmpBCl2 (9) with tert-butylamine produces no diazadiboretidine 2 but 3 and tmpB[NHC(CH3)3]2 (10). - The X-ray structure analysis of 2 (monoclinic, P21/n, Z = 2) reveals a point group symmetry Ci for this molecule. Its planar B2N2 four-membered ring has the shape of a slightly diamond distorted square. The tmp groups are almost orthogonally oriented towards the B2N2 ring. All BN bond lengths are equal (BN 146.7 pm).
    Notes: Chlorwasserstoff addiert sich an das Amino-imino-boran 1 zu tmpB(Cl)NHC(CH3)3 (3) (tmp = 2,2,6,6-Tetramethylpiperidino-Gruppe), das auch das erste faßbare Produkt der Einwirkung von HCl auf [tmp-B=NC(CH3)3]2 (2) ist. Die weitere Umsetzung führt zum Salz tmpHBC[NH-C(CH3)3]Cl (7c), das mit HCl letztlich zu [tmpH2]Cl weiterreagiert. Die Aminolyse von tmpBCl2 (9) mit tert-Butylamin liefert kein Diazadiboretidin 2, sondern 3 und tmpB[NHC(CH3)3]2 (10). - Nach der Röntgenstrukturanalyse besitzt 2 (monoklin, P21/n, Z = 2) die Symmetrie der Punktgruppe Ci. Der planare B2N2-Vierring ist schwach rautenförmig gebaut. Die tmp-Gruppe steht fast orthogonal zum Vierring. Alle BN-Abstände sind gleich lang (BN 146.7 pm).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851181207
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  • 8
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, 145. Synthese und Charakterisierung von Tris(dihalogenboryl)aminen (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 86-96 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Boron, 145. Synthesis and Characterisation of Tris(dihaloboryl)aminesTris(dichloroboryl)amine (1) results from stannazane cleavage of N(SnMe3)3 with a large excess of BCl3. Transhalogenation of 1 with BBr3 leads to N(BBr2)3 (7) by Cl/Br exchange while antimony trifluoride provides access to N(BF2)3 (8) which is stable up to ∽ 100°C. NMR data and mass spectral fragmentation are discussed. The former suggests a planar geometry for N(BF2)3 (8) while the latter indicates a high stability of the iminoborane X2B—N = BX in the gas phase.
    Notes: Tris(dichlorboryl)amin (1) entsteht bei der Stannazanspaltung von N(SnMe3)3 mit einem großen BCl3-Überschuß. Transhalogenierung von 1 mit BBr3 liefert unter Cl/Br-Austausch N(BBr2)3 (7), während es von Antimontrifluorid in N(BF2)3 (8) übergeführt wird, das nur bis ∽ 100°C stabil ist. Kernresonanzspektroskopische Daten und die massenspektrometrische Fragmentierung werden diskutiert. Erstere legen eine planare Molekülgeometrie für N(BF2)3 (8) nahe, letztere deuten auf eine relativ hohe Stabilität der Iminoborane X2B—N = BX in der Gasphase hin.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180109
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  • 9
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, 154. Addition von Trimethylsily-Verbindungen und von anderen Elektrophilen an (tert-Butylimino) (tetramethylpiperidino)boran (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 2144-2146 
    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, 154. Addition of Trimethylsilyl Compounds and Some Other Electrophiles to (tert-Butylimino)-(tetramethylpiperidino)boraneThe amino-imino borane 3 adds methyl triflate and triflic acid to form tricoordinated borane derivatives (1, 4). In contrast, trimethylsilyl triflate and trimethylsilyl iodide yield salts (2, 5) of the [tert-butyl(trimethylsiyl)amino](tetramethylpiperidino)boron(1+) cation containing a dicoordinated boron atom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180536
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  • 10
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, 173. Über Salze des Bis(diisopropylamino)bor(1+)-Kations (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 2075-2079 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Boron, 173. Salts of the Bis(diisopropylamino)boron(1+) CationBromobis(diisopropylamino)borane (1) reacts with aluminium and gallium tribromide to produce stable salts of type [(iPr2N)2B]EBr4 (2, 3). Silver triflate converts 1 into bis(diisopropylamino)[(trifluoromethyl)sulfonyloxy]borane (4), while silver tetratriflatoborate produces a mixture of 4 with the salt [(iPr2N)2B]B(OSO2CF3)4 (6). Furthermore (diisopropylamino)bis[(trifluoromethyl)sulfonyloxy]borane (7) is formed.
    Notes: Bis(diisopropylamino)borbromid (1) reagiert mit Aluminium-oder Galliumtribromid zu den stabilen Salzen [(iPr2N)2B]EBr4 (2, 3), während 1 mit Silber-triflat Bis(diisopropylamino)-[(trifluormethyl)sulfonyloxy]boran (4) liefert. Silber-tetratriflatoborat setzt sich mit 1 zu einem Gemisch von 4 mit dem Salz [(iPr2N)2B]B(OSO2CF3)4 (6) um. Ferner entsteht (Diisopropylamino)bis[(trifluormethyl)sulfonyloxy]boran (7).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19861190702
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