Trimethylsilylierte 1,4‐Diborinane und 1,3‐Diborolane ‐ Bildung, Isomeren‐Trennung und Charakterisierung

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Abstract
Trimethylsilylated 1,4‐Diborinanes and 1,3‐Diborolanes – Formation, Isomer Separation, and CharacterisationMe3SiCCH (A) reacts with excess (Et2BH)2 via the compounds 1, 1′ and 2, 2′ to yield a mixture of four regio‐ and stereoisomeric 1,4‐diethyl‐2,5(6)‐bis(trimethylsilyl)‐1,4‐diborinanes (3a–d) and minor amounts of 1,3‐diethyl‐2‐methyltrans‐2,5‐bis(trimethylsilyl)‐1,3‐diborolane (4a). The 2,5‐ee‐(Me3Si)2 compound 3d is isolated as the adduct 3d(Pic)2 (X‐ray structure analysis), from which pure 3d is obtained with Et2O‐BF3. 3d and Me3P form equilibria of the 1:1 and 1:2 addition compounds 3d(Me3P)n (n = 1,2) at room temperature. Me3SiCCMe (B) reacts with (Et2BH)2 via 5 to give 6–10, and Me3SiCCSiMe3 (C) reacts with (Et2BH)2 to form the ring compounds 12 and 13 via the presumably threo/erythro mixture of 11a and b.

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