Reaction of either n-Bu3SnCu(CN)Li (8) or (n-Bu3Sn)2Cu(CN)Li2 (9) with 1,2-undecadiene gave 71–92% of a (Z/E) mixture of 1-tri-n-butylstannyl-2-undecene (27) accompanied by 8–32% of a mixture of (E)-2-tri-n-butylstannyl-2-undecene (28) and 2-tri-n-butylstannyl-1-undecene (29). When the above reactions were warmed to 0 °C, 28 and 29 were the major products. The mixed cuprates, 10–14, gave the mixtures rich in vinylstannanes, 28 and 29, along with 27. Addition of Sn—Al reagents, 15 and 16, or Sn—B reagents, 18 and 19, to 1,2-undecadiene in the presence of 5 mol% of CuCN or CoCl2•(PPh3)2 provided mixtures rich in vinylstannanes, 28 and 29. However, with 1 equiv. of CuCN, mixtures rich in allylstannanes 27 were obtained. Reaction of 5-hydroxy-1,2-pentadiene with the Sn—Al reagents, 15 and 16, gave 53–61% of a single 5-hydroxy-2-tri-n-butylstannyl-1-pentene (32) in the presence of 5 mol% of CoCl2•(PPh3)2. The stannylcopper adducts generated in the reaction of 1,2-undecadiene and 8 or 9 were treated with iodomethane to give 55–78% of a (Z/E: 67/33) mixture of 1-tri-n-butylstannyl-2-methyl-2-undecene (33). Addition of mixed silylcuprates, 21, 22, and 23, to 1,2-undecadiene gave mixtures rich in (E)-2-dimethylphenylsilyl-2-undecene (35) and 2-dimethylphenylsilyl-1-undecene (36). A rationale for the putative adducts' formation is also presented. Key words: Sn—Cu, Sn—Al, Sn—B reagents; putative adducts.