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The reaction of SnCl 2 with the Ru-Cl bond of the Grubbs I catalyst RuCl 2 (dCHPh)(PCy 3 ) 2 (1) gives the complex {[Ru(dCHPhbut containing two diethyl ether solvate molecules. The formal insertion of SnCl 2 into one Ru-Cl bond of the Hoveyda II catalyst RuCl 2 (dCH-C 6 H 4 OPrin formation of the new complex RuCl(SnCl 3 )(dCH-C 6 H 4 OPr i )(H 2 IMes) (4). The X-ray analyses of 2 and 4 show the presence of very short Ru-Sn bonds (2.5834(9) A ˚mean bond for 2 and 2.5925(12) A ˚for 4) and the retention of short RudC bonds (1.895(10) and 1.825(8) A ˚, respectively). Complex 4 shows an excellent catalytic activity for the cross-metathesis of plant oil derivatives, the C11 ω-unsaturated ester and aldehyde and the unsaturated C18 diester with acrylonitrile, and a good activity for their cross-metathesis with methyl acrylate. Good to excellent yield of R,ω-bifunctional compounds, precursors of polyesters and polyamides, were obtained. Complex 2 shows catalytic activity for the self-metathesis of C11 ω-unsaturated aldehyde at low concentration to produce C20 R,ω-dialdehyde.

Das aus dem Boranat (I) unter Triethylamin‐Einwirkung entstehende Niobocenhydrid (II) wird mit Mng ‐ (CO)", zur Titelverbindung (III) (IR‐Daten) umgesetzt.