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Alkynylstannanes 1 react with Cp2Zr(H)Cl (Cp=η5-C5H5) giving (Z)-α-stannylvinyl- zirconium complexes 2, which are trapped with NBS or iodine in THF at 0°C to stereoselectively afford (Z)-α-bromovinylstannanes and (E)- β-iodovinylstannanes 3, respectively.