The α-adduct is the sole product of the coupling of vinyl- and allylzirconium compounds with ZnCl2 (see below), provided no MgII salts are present. The zirconium compounds are formed in situ from alkynes and allenes, and the overall reaction opens a new preparative route to the vitamin E side chain through asymmetric induction in the 1,5-position. R1 = CH2OCPh3, R2 = CHMeCH2OCH2OMe, “Zr” = [Cp2Zr(H)Cl].
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Suzuki et al. (1997) studied this question.
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