Abstract
The reaction of Ru3(CO)12 with MeO2C(H)C=C=C(H)CO2 Me has yielded two isomeric productsanti-Ru2(CO)6[μ-η3-η1-MeO2C(H)CCC(H)CO2Me],1 in 70% yield andsyn-Ru2(CO)6[μ-η3-η1-MeO2C(H)CCC(H)CO2Me],2 in 5% yield. Both compounds were characterized by single crystal X-ray diffraction analysis. Both products are diruthenium complexes with bridging di(carboxylate)allene ligands in which the oxygen atom of the carbonyl group of one of the carboxylate groupings is coordinated to one of the metal atoms. Compound1 isomerizes partially to2 at 68°C. Crystal Data for1: space group=P21/n,a=11.131(1) A,b=10.228(2) A,c=15.978(2) A,β=102.01(1)°,Z=4, 1653 reflections,R=0.025; for2: space group=P\(\bar 1\),a=9.340(1) A,b=14.925(4) A,c=6.778(2) A,α=99-02(2)°,β=104 62(2)°,γ=94.58(2)°,Z=2, 1857 reflections,R=0.027.
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