Abstract
AbstractWhereas the addition of tributyl(trimethylgermyl)stannane (II) to 1‐alkynes in the presence of catalytical Pd(PPh3)4 proceeds regiospecifically, the direction of its addition to allenes e.g. (I) is dependent on the substituent R. In the case of (Ia) only the regioisomeric vinyltin compound (IIIa) is formed, while with increasing size of R the vinyl‐Ge compounds (IV) are also produced with increasing yields.
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