Cyclooctatetraene complexes rhodium

Cyclooctatetraene (continued) with iron, 12 267-273 with nickel, 12 307, 308 with palladium, 12 315 with platinum, 12 319 with rhodium, 12 304 with ruthenium, 12 280 with silver, 12 340, 342, 343, 346 complexes of, 4 81 iron complexes of, 4 89 Cyclooctatriene complexes... 

Cyclooctatetraene also forms interesting complexes with cobalt, rhodium, nickel, and other transition metals, but these will not be elaborated on here. It should also be mentioned that other eight-mem-bered ring systems, such as 1,5-cyclooctadiene, 1,3,5- and 1,3,6-cyclo-octatrienes, etc., form a variety of metal, t complexes. The most recent survey of cyclooctatetraene and related metal, t complexes is the review by Fischer and Werner (100) as well as earlier reviews by these authors (99) f and Bennett (11). 

CgHg, 1,3,5,7-Cyclooctatetraene, lithium complex, 28 127 lutetium complexes, 27 152, 153 CgH NO, Benzoyl isocyanide, chromium complex 26 32, 34, 35 CgHg04, Phthalic acid, rhodium complex, 27 291... 

A thermally unstable complex of rhodium(I), [ir-CgH8RhCl]2, prepared from ethanolic rhodium(III) chloride and cyclooctatetraene, shows two proton resonance lines at 5.8 r and 4.3 r in carbon disulfide, and probably also contains the tub form of the olefin (13). 

As was pointed out in Chapter 5, with reference to the conjugated ligand cyclooctatetraene, and as the structures of the cyClobutenyl nickel complex, 7.IS, and of the rhodium complex 7.18 show, it is not necessary for all the annular carbon atoms of a cyclic unsaturated hydrocarbon ligand to be involved in bonding to a metal. Further examples of this are shown in Figure 41, where in complexes derived from S-, 6- and 7-membered ring systems respectively, only 5 electrons are formally involved in the bonding in each case. 

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