Cyclooctene complexes silver

Reaction between the cyclooctene complex [(C8Hi4)2lrCl]2 and >4 equivalent of silver fluoroacetate produces a highly active system for metathesis/isomerization of... 

The oxidized forms of 49 are susceptible to attack by electron donors. The dication [49] (R = H), generated in situ from [49] and silver(I) ions, reacts with alkenes to give, for example, [Q)(7i -cyclooctene) (NO)Cp] the cation [49]" reacts with PPhs to give [Co(PPh3)(NO)Cp] but the neutral complex 49 is inert (116). 

It is also not clear why the diolefin 1,5-cyclooctadiene forms a weaker bond to silver than cyclooctene. The effects of strain differences within the olefins and/or within the complexes is not apparent30, but in any case suggests, as noted by the original authors, a negligible interaction between the metal and the second double bond. However, the cyclooctatetraene complex is asserted to be polymeric in solution and so currently precludes obtaining useful information derived from these complexation studies of this species. 

Distribution measurements show that the silver complex of dr-cyclo-octene is less stable than that of cycloheptene, presumably owing to more ring strain in the latter 129,130). tronr-Cyclooctene is considerably more strained than the cis isomer, and can be separated from it by extraction with 20% aqueous silver nitrate 32), but there are no quantitative measurements of the stability of the silver complex of the tram isomer. The interesting possibility of isomerizing cis to trom-cyclooctene via metal complexes has not yet been achieved. tronr-Cyclooctene has been resolved via its platinum(II) complex with the optically active amine l-phenyl-2-amino-propane (am), 7r-CgH]4PtCl2am. 29). 

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