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The reaction of a ruthenium carbide complex RuCl2(C:)(PCy3)2 with [H(Et2O)x]+[BF4]- at a molar ratio of 1:2 produced a two-core ruthenium carbene complex, {[RuCl(=CHPCy3)(PCy3)]2(μ-Cl)3}+·[BF4]-, in the form of a yellow-green crystalline solid in a yield of 94%. This two-core ruthenium complex is a selective catalyst for ring closing metathesis of unsubstituted terminal dienes. More importantly, no isomerized byproduct was observed for N-substrates when the two-core ruthenium complex was used as the catalyst at an elevated temperature(137 °C), indicating that the complex is a chemo-selective catalyst for ring closing metathesis reactions.
The reaction of a ruthenium carbide complex RuCl2 (C:) (PCy3) 2 with [H (Et2O) x] + [BF4] - at a molar ratio of 1: 2 produced a two-core ruthenium carbene complex, {[RuCl = CHPCy3) (PCy3)] 2 (μ-Cl) 3} + · [BF4] -, in the form of a yellow- green crystalline solid in a yield of 94%. This two-core ruthenium complex is a selective catalyst for ring closure metathesis of unsubstituted terminal dienes. More importantly, no isomerized byproduct was observed for N-substrates when the two-core ruthenium complex was used as the catalyst at an elevated temperature (137 ° C), indicating that the complex is a chemo- selective catalyst for ring closing metathesis reactions.