T. Miyaji et al., Generation of copper(I) complexes with a tethered olefin-phosphine ligand from CuCl-mediated reaction of alkenylzirconocene with R2PCl, ORGANOMETAL, 20(13), 2001, pp. 2859-2863
alpha -Substitueed alkenylzirconocenes, Cp2Zr(OSiMe3){C(R) = C(R)CH2CH = CH
2} (R = Pr (1a); R = Ph (Ic)), which were prepared in situ by the reaction
of zirconacyclopentenes with (allyloxy)trimethylsilane, reacted with R ' 2P
Cl in the presence of CuCl to give the Cu(I) complexes [mu -Cl)Cu(PR ' C-2(
R) = C(R)CH2CH = CH2)](2) (R = Pr, R ' = Ph (2a); R = Pr, R ' = i-Pr (2b);
R = Ph. R ' = i-Pr (2c)) with tethered olefin-phosphine ligands bidentately
coordinating to copper(I) in good to high yields. The molecular structures
of 2a and 2c were determined by single-crystal X-ray diffraction studies.