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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Inorganic and Nuclear Chemistry Letters 8 (1972), S. 191-194 
    ISSN: 0020-1650
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Organometallic Chemistry 36 (1972), S. 257-265 
    ISSN: 0022-328X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Organometallic Chemistry 381 (1990), S. 299-313 
    ISSN: 0022-328X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Organometallic Chemistry 347 (1988), S. 11-16 
    ISSN: 0022-328X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Organometallic Chemistry 295 (1985), S. 1-6 
    ISSN: 0022-328X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1995-2000 
    ISSN: 0044-2313
    Keywords: 2,6-Diisopropylphenyl-, Amino(fluoro)boranes ; Amino-imino-boranes ; Diazadiboretidines ; Diazasilaboretidines ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The 2,6-Diisopropyl-phenyl Group as a Bulky Substituent in Boron-Nitrogen Compounds. IIFluoro-bis(amino)boranes R′ (Me3Si)N-BF-NHR (R = 2,6-)Me2CH)2C6H3, R′ = Me (Ia), CH2Me (Ib), CHMe2 (Ic), CMe (Id), SiMe3 (Ie), R (If) react with t-butyllithium (molar ratio 1:1) by elimination of HF to give the amino-imino-boranes (IIa - f). The thermal stabilities of the latter depend upon the steric requirement of the substituent R′, IIa - c and IIe dimerize to yield the diazaboretidines IIIa - c and IIIe. IId remains unchanged at 200°C and above, and IIf isomerizes forming the B-Me substituted diazasilaboretidine IVf. If a twofold amount of t-butyllithium is employed, B-CMe3 substituted diazasilaboretidines (Va - f) are the main products. All compounds are characterized by elemental (C, H) analyses and their mass- and n.m.r. (1H, 13C, 15N (in part), 19F, 29Si) spectra. Characteristic i.r.-bands are reported for the amino-imino-boranes (II). An X-ray structure analysis is presented for IVf.
    Notes: Die HF-Eliminierung aus Fluorbis(amino)boranen des Typs R′ (Me3Si)NBFNHR (R = 2,6-)Me2CH)2C6H3, R′ = Me (Ia), CH2Me (Ib), CHMe2 (Ic), CMe3 (Id), SiMe3 (Ie), R (If)) mit t-Butyllithium im Molverhältnis 1:1 führt zu den Amino-imino-boranen (IIa-f), die - abhängig von der Größe des Substituenten R′ - unterschiedliche thermische Stabilität aufweisen. IIa - c und IIe dimerisieren zu den Diazadiboretidinen IIIa - c und IIIe. IId ist bis über 200°C stabil, während sich IIf bei dem Versuch seiner Isolierung zum Bor-Methyl-substituierten Diazasila-boretidin IVf umlagert. Führt man die gleiche Umsetzung mit t-Butyllithium im überschuß (Molverhältnis 1:2) durch, erhält man fast ausschließlich die Bor-t-Butyl-substituierten Diaza-sila-boretidine Va - Vf.Alle Verbindungen sind elementaranalytisch (C, H) und spektroskopisch MS, NMR (1H, 13C, 15N (teilweise), 19F, 29Si) charakterisiert. Charakteristische IR-Banden werden für die Amino-imino-borane (II) angegeben. Eine Röntgenstruktur-analyse wurde von IVf angefertigt.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 608 (1992), S. 147-152 
    ISSN: 0044-2313
    Keywords: 2,4,6-Tri-t-butylphenyl-substituted amino-imino boranes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Supermesityl stabilized IminoboranesAmino-iminoboranes R′(SiMe3)N-B≡N-R: IIc (R′ = CHMe2), IId (R′= CMe3) and IIe (R′ = SiMe3) carrying the supermesityl group (R) on the imino nitrogen atoms have been prepared from the corresponding fluorobis(amino)boranes Ic-e by HF-elimination using t-BuLi (IIc, d) or n-lithio-bis(trimethylsilyl)amid (IIe). The Amino-iminoboranes are thermally stable at room temperature. Upon treatment of the fluorobis(amino)boranes Ia, Ib, Ie with t-BuLi, LiF and HN(SiMe3)R′ are eliminated and the B-t-butyl substituted iminoborane III is formed. The compounds are characterized by elementar analyses and spectroscopic data (MS, IR, NMR). An X-ray diffraction study has been performed for II d.
    Notes: Amino-imino-borane R′(SiMe3)N-B≡N-R:IIc (R′ = CHMe2), IId (R′= CMe3) und IIe (R′ = SiMe3) mit R = 2,4,6-Tri-t-butylphenyl- wurden aus den entsprechenden Fluorbis(amino)boranen Ic-e durch HF-Eliminierung mit t-Butyllithium (IIc, IId) bzw. Lithiumbis(trimethylislyl)amid (IIe) erhalten. IIc-e sind thermisch stabil und bei Raumtemperatur unbegrenzt haltbar. Die Umsetzungen der Fluorbis(amino)borane Ia (R′ = Me), Ib(R′ = CH2Me) und Ie (R′ = SiMe3) mit t- Butyllithium führen zur Abspaltung von LiF und HN(SiMe3)R′, wobei sich in allen Fällen des B-t-butyl-substituierte Iminoboran III bildet. Die Verbindungen sind elementaranalytisch und spektroskopisch (MS, IR, NMR) charakterisiert. Eine Röntgenstrukturanalyse wurde von IId durchgeführt.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1474-1478 
    ISSN: 0044-2313
    Keywords: 2,4,6-Tri-t-butylphenyl-substituted iminoboranes ; thermal condensation ; benzo[1]borolanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Supermesityl stabilized Iminoboranes. IIINew Iminoboranes R—B=N—R′ (R = 2,4,6(t-Bu)3C6H2), IIa-IIf, were obtained by base-induced HF-elimination from RBF—NHR′ (Ia-Ie) or directly from RBF2 and lithiated H2NR′ (for IIf). Compounds II exhibit a differentiated behaviour upon thermal treatment depending on R′. While IIa (R′ = H) immediately reacts to give the corresponding benzo[1]borolane IIIa, the dimeric diazadiboretidine is formed from IIb (R′ = Me) at 100°C; IIc (R = Et) and IId (R = C6H5) deliver the benzo[1]borolanes IIIc and IIId when they are heated to 180°C (in melt). IIe (R = 2,6(i-Pr)C6H3) and IIf (R = adamantyl) are stable at 250°C. All compounds were characterized by elemental analyses and spectroscopically (MS, IR, NMR: 1H, 13C, 11B, 19F and in part 15N).
    Notes: Neue Iminoborane R—B=N—R′ (R = 2,4,6(t-Bu)3C6H2), IIa-IIf, wurden durch baseninduzierte HF-Eliminierung aus RBF—NHR′ (Ia-Ie) oder direkt aus RBF2 und lithiiertem H2NR′ (für IIf) erhalten. Die Verbindungen von Typ II zeigen in Abhängigkeit von R′ ein ausgeprägt differenziertes Verhalten bei thermischer Belastung. Während IIa (R′ = H) sofort zum entsprechenden Benzo[1]borolan IIIa weiterreagiert, ergibt IIb (R′ = Me) bei 100°C das dimere Diazadiboretidin IVb, während IIc (R = Et) und IId (R — C6H5) erst als Schmelze bei 180°C zu den Benzo[1]borolanen IIIc und IIId reagieren. IIe (R = Adamantyl) und IIf (R = 2,6-(i-Pr)2C6H3) sind bei 250°C stabil. Alle Verbindungen wurden elementaranalytisch und spektroskopisch (MS, IR, NMR: 1H, 13C, 11B, 19F und teilweise 15N) charakterisiert.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1403-1408 
    ISSN: 0044-2313
    Keywords: Supermesitylboryl ; Metallaheterocycles ; Phosphaheterocycles ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metalla- and Phosphaheterocycles with Diaminosupermesitylboryl UnitsRB(NMeLi)2 is reacted with dimethylmetaldichlorides to give four membered (n = 1) metallacycles of the type (—RB—NMe—MMe2—NMe—)n (M = Si, IIa; M = Ge, IIb) and the eight membered ring (n = 2) with M = Sn, III. The four membered ring (—RB—NMe—PCMe3—NMe—), IV, is formed with Me3CPCl2. RBF2 and lithiated N,N′-dimethylethylenediamine give the five membered ring RB(—NMe—CH2 - )2, Va. The reaction of RB(NHMe)2 with trimethylaluminum upon elimination of methane yields the symmetrical eight membered ring system (—RB—NMe—AlMe—NMe—)2, VI. The compounds are characterized by their m.s. and n.m.r. (1H, 11B, 13C, 29Si, 31P, 119Sn and in part 15N) spectra, and with the exception of III and VI also by elemental analyses. An X-ray structure analysis is provided for III.
    Notes: RB(NMeLi)2 (R = 2,4,6-Tri-t-butylphenyl) wird mit Dimethylmetalldichloriden zu viergliedrigen Metallacyclen (n = 1) des Typs (—RB—NMe—MMe2—NMe—)n (M = Si, IIa; M = Ge, IIb) bzw. dem achtgliedrigen Ring (n = 2) mit M = Sn, III, umgesetzt. Mit Me3CPCl2 entsteht der Vierring (—RB—NMe—PCMe3—NMe—), IV. Aus RBF2 und lithiiertem N-N′-Dimethylethylendiamin wird der Fünfring RB(NMe—CH2 - )2, Va, erhalten. Die Reaktion von RB(NHMe)2 mit Trimethylaluminium führt unter Methanabspaltung zu dem symmetrischen achtgliedrigen Ringsystem (—RB—NMe—AlMe—NMe—)2, VI. Die Verbindungen sind spektroskopisch MS und NMR (1H, 11B, 13C, 29Si, 31P, 119Sn und teilweise 15N) und bis auf III und VI auch elementaranalytisch charakterisiert; eine Röntgenstrukturanalyse wurde von III durchgeführt.
    Additional Material: 1 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 560 (1988), S. 18-26 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The 2,6-Diisopropyl-phenyl Group as a Bulky Substituent in Boron-Nitrogen Compounds2,6-Diisopropylaniline (RNH2), the monosilylated derivative (RNH—SiMe3) and its lithium salt (RNLiSiMe3) have been reacted with F3B · OEt2 by variation of the reaction conditions. Products as RNH—BF—NR—BF—NHR, 1, RNH—BF—NHR, 3, Me3SiNR—BF2, 4, and (Me3SiNR)2BF, 5 are thus obtained. Substitution of fluorine atoms in 4 by lithium organyls (R′Li) leads to aminoboranes of the type Me3SiNR—B(F)R′ (R′ = Me, CMe3, C6H5, NHR, N(SiMe3Si)2N), 7a-7e. Thermolysis of 7b gives the diazadiboretidine (—BCMe3—NR—)2, 8. Attempted preparation of the corresponding amino-iminoborane by elimination of Me3SiF and HF from 5 or Me3SiNR—BF—NHR, 7d, yielded the benzoannelated heterocycle 6 and the 1,3-diaza-2-sila-4-bore-tidine 9. The compounds are characterized by analyses and their mass and n.m.r. (1H, 11B, 13C, 15N, 19F, 29Si) spectra.
    Notes: 2,6-Diisopropylanilin (RNH2), dessen monosilyliertes Derivat (RNHSiMe3) bzw. dessen Lithiumsalz (RNLiSiMe3) wurden mit F3B · OEt2 bei unterschiedlichen Reaktionsbedingungen umgesetzt. Dabei erhielt man die Produkte RNH—BF—NR—BF—NHR, 1, RNH—BF—NHR, 3, Me3SiNR—BF2, 4 und (Me3SiNR)2BF, 5. Die Substitution von Fluoratomen in 4 mit Lithiumorganylen (R′Li) führt zu Aminoboranen des Typs Me3SiNR—B(F)R′ (R′ = Me, CMe3, C6H5, NHR, (Me3Si)2N) 7a-7e. Die Thermolyse von 7b führt zum Diazadiboretidin (—BCMe3—NR—)28. Versuche aus 5 und Me3SiNR—BF—NHR, 7d, durch Abspaltung von Me3SiF bzw. HF, das entsprechende Amino-Iminoboran darzustellen, ergaben den Benzo-annelierten Heterocyclus 6 und das 1,3-Diaza-2-sila-4-boretidin 9. Die Verbindungen sind analytisch sowie Massen- und NMR- (1H, 11B, 13C, 15N, 19F, 29Si) spektroskopisch charakterisiert.
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