Abstract
Reactions of LiSnR3 (R = Me, Ph) with Cl(Me2N)B−B(NMe2)Cl lead to the corresponding 1,2-(triorganylstannyl)diboranes(4) 1a,b. Similarly, when the triborane(5) Cl(Me2N)B−BNMe2−B(NMe2)Cl is reacted with Me3SnLi at low temperature the bis(trimethylstannyl)triborane 2a is formed. In contrast, when the dibromide Br(Me2N)B−BNMe2−B(NMe2)Br is allowed to react with Me3SnLi only small amounts of 2a are formed; the main product being the cyclic isomer 2b. Compounds 1a and 2b were characterized by X-ray crystal structure analysis. Compound 2b has quite short B−Sn bonds. Oxidative addition of 1a with ethylenebis(triphenylphosphane)platinum(0) yields cis-bis(trimethylstannyl)bis(triphenylphosphane)platinum(II) (3) besides trimethylstannyl[trimethylstannylbis(dimethylamino)diboranyl(4)]bis(triphenylphosphane)platinum 4. These compounds were characterized by NMR spectroscopy.
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