Abstract
The dicomponent Mo(NO) 2(OR) 2EtAlCl 2 and tricomponent Mo(NO) 2(OR) 2Et 4SnAlCl 3 catalytic systems as well as ethylidene complexes [(AlCl 2) 2(μ-OR) 2Mo(NO) 2(CHMe)] (R = Et, iPr) show activity for self-metathesis of ethyl but-3-enoate and very limited activity for cometathesis of this ester with trans-hex-3-ene. Blocking of the Lewis basic functional groups of this ester with a Lewis acid (EtAlCl 3, AlCl 3), however, increased the effectiveness of the catalysts used. Metathesis reactions of Zn(oleate) 2 and Al(O-allyl) 3 by both catalytic systems, without excess Lewis acid co-catalysts, demonstrate that coordination of the functional groups to the appropriate metal ions completely eliminated the poisoning effect of these groups.
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