Reactions between HCCCCSiMe3 and several ruthenium halide precursors have given the complexes Ru(CCCCSiMe3)(L2)Cp′
[Cp′
= Cp, L = CO (1), PPh3
(2); Cp′
= Cp*, L2
= dppe (3)]. Proto-desilylation of 2 and 3 have given unsubstituted buta-1,3-diyn-1-yl complexes Ru(CCCCH)(L2)Cp′
[Cp′
= Cp, L = PPh3
(5); Cp′
= Cp*, L2
= dppe (6)]. Replacement of H in 5 or 6 with Au(PR3) groups was achieved in reactions with AuCl(PR3) in the presence of KN(SiMe3)2 to give Ru(CCCCAu(PR3)}(L2)Cp′
[Cp′
= Cp, L = PPh3, R = Ph (7); Cp′
= Cp*, L2
= dppe, R = Ph (8), tol (9)]. The asymmetrically end-capped {Cp(Ph3P)2Ru}CCCC{Ru(dppe)Cp*}
(10) was obtained from Ru(CCCCH)(dppe)Cp* and RuCl(PPh3)2Cp. Single-crystal X-ray structural determinations of 1–3 and 6–9 are reported, with a comparative determination of the structure of Fe(CCCCSiMe3)(dppe)Cp*
(4), and those of a fifth polymorph of {Ru(PPh3)2Cp}2(μ-CCCC)
(12), and {Ru(dppe)Cp}2(μ-CCCC)
(13).
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