The Synthesis Characterization And Investigation Of The Catalytic Activties Of Some L O 5-cyclooctadiene And 25-norbornadiene Group Vib Transition Metal C1rbene Carbonyl Complexes

The reaction of l,5-cyclooctadiene tetracarbonyl tungstenrn(0) with methyllithium gave products in which the dienernis no more coordinated to the metal. It was investigated thatrnthe compound is catalytically active and could metathesize 2~rnpentene into 2-butene and 3-hexene in the presence of EtAlCl 2rnas a cocatalyst.rnA series of some (diene)U(CO) 4.' :.Jdiene)M(CO} 4 =rn(l,5-cyclooctadiene}W(CO}4' (2,S-norbornadiene}W(CO}4'rn(2, S-norbornadiene) Mo (CO) 4' (2, S-norbornadiene) Cr (CO) 4 J, andrn(CH3CN}3Mo(CO}3 complex were tested in the ratio of M to coca~rntalyst to 2--pentene to be 1:0:1000. For comparison the activernfofClO-C2HSOH-C2HSAlCl2 System lJaS used. Gas chromatographicrnanalysis of the reaction products showed that (2,5-norbornadiene)W(rnCO}4 is able to give 59.24% conversion after 24 hours at roomrntemperature. The other complexes showed different percentagernconversions and (NBD)Cr(CO) 4 was found to be completely inacti1!e

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