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  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Aminoiminoboranes as Synthons for the Preparation of Three- and Four-membered Rings with the Ring-Atom Sequence BNE, BNBE, BNSiE, and NBNE (E = P, Partly also B, Si, Ge, As)Dihalides AHal2 add to the iminoborane iPr2NBNtBu (1a) to give diaminoboranes iPr2NB(Hal)N(tBu)-AHal (2j); by the substitution of Hal by NiPr2 or Me in 2e, f, j the derivatives 2k-m are formed. With the aid of alkali metal, the diaminoboranes 2a, c, d, m are dehalogenated to the three-membered ring compounds [—B(NiPr2)N(tBu)—A—] with A = B(NiPr2) (3), SiR2 (4a, b), P(NiPr)2 (5), whereas the dechlorination of 2a, c with Li2EPh (E = P, As) yields the four-membered ring products [—B(NiPr2)N(tBu)—A—E(Ph)—] with A = B(NiPr2) (6, 7), SiMe2 (8, 9). Dichlorides ACl2 are added to the iminoborane Me3Si(tBu)NBNtBu (1b) to give either the diaminoboranes Me3Si(tBu)NB(Cl)N(tBu)— ACl (2n-w) or the four-membered rings [—N(tBu)B(Cl)N(tBu)—A—] with A = GeMe2 (12), PX (13a-e), AsCl (14a), Me3SiCl being a second product. The same type of ring compound with A = BX (10a-d), SiX2 (11a, b) is formed from 2n-s during the elimination of Me3SiCl by the action of the solvent chloroform at room temperature. The Cl atom in these ring compounds can be substituted by alkyl, amino, or alkoxy groups to give 10e, f, 13f-h, 14b-j. The configuration and conformation of the products in solution and the structure of 3, 6, 7, 12, 14b in the solid state are discussed on the basis of NMR and X-ray data, respectively.
    Notes: Die Addition von AHal2 an das Iminoboran iPr2NBNtBu (1a) ergibt die Diaminoborane iPr2NB(Hal)N(tBu)—AHal (2a-i) und das Triaminoboran (iPr2N)2BN(tBu)—AsBr2 (2j); der Austausch von Hal in 2e, f, j gegen NiPr2 bzw. Me führt zu den Produkten 2k-m. Durch Enthalogenierung von 2a, c, d, m mit Alkalimetall gelangt man zu den Dreiringverbindungen [—B(NiPr2)N(tBu)-;A-] mit A = B(NiPr2) (3), SiR2 (4a, b), P(NiPr2) (5), während sich mit Li2EPh (E = P, As) aus 2a,c Vierringverbindungen des Typs [—B(NiPr2)N(tBu)—A—E(Ph)—] mit A = B(NiPr2) (6, 7), SiMe2 (8, 9) bilden. Addiert man ACl2 an das Iminoboran Me3Si(tBu)NBNtBu (1b), so entstehen entweder die Diaminoborane Me3Si(tBu)NBN(tBu)—ACl (2n-w) oder unter Abspaltung von Me3SiCl die Vierring verbindungen [—N(tBu)B(Cl)N(tBu)—A—] mit A = GeMe2 (12), PX (13a-e), AsCl (14a). Denselben Typ von Vierringverbindungen mit A = BX (10a-d), SiX2 (11a, b) erhält man neben Me3SiCl bei der Einwirkung von Chloroform auf 2n-s. Durch Austausch des an das B-, P- oder As-Atom in jenen Vierringen gebundenen Cl-Rests gegen Alkyl-, Amino- und Alkoxygruppen kommt man zu den Derivaten 10e, f, 13f-h, 14b-j. Die Konfiguration aller Produkte in Lösung wird anhand der NMR-Spektren und die Struktur von 3, 6, 7, 12, 14b in festem Zustand anhand röntgenographischer Untersuchungen diskutiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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