Ein weiterer Beitrag zur Stabilisierung der Iminoborane RB≡NR′

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Abstract
A Further Contribution to the Stabilization of Iminoboranes RB≡NR'The iminoboranes (tBuB≡NR (1a, b, R=iPr, Ph) and RB≡NR (1c, d; R=Me3CCH2, Me3SiCH2) were prepared by gas‐phase thermolysis of Cl(tBu)BN(R)SiMe3 (6a, b) and R2BN3 (7c, d), respectively. At room temperature, the molecules 1a–c cyclodimerize to the diazadiboretidines 2a–c, whereas the borane 1d cyclotrimerizes to the borazine 3d; these stabilization reactions are discussed in terms of the steric demand of the organic ligands. The ethyloboration of 1a, c with BEt3 BCl to 1a yields the diborylamine 9d. Benzyl azide and 1c, d undergo a [3 + 2] cycloaddition with formation of the tetrazaborolidines 10c, d.