Cyclooctatetraene complexes platinum

This method of resolution of polyolefins has been extensively studied for cyclooctatetraene systems where excellent enantiomeric excesses are normally observed. Lanthanide-induced shifting can be used to determine the diastereoisomeric composition of the urazoles. Alternate means for the resolution of polyenes based on kinetic resolution using (+)-tetra-2-pinany Iborane have been described, but this reagent consumes valuable substrate. Chiral platinum complexes can also be used but at prohibitive cost on a large scale and with poor regioselec-tivity when several coordination sites are present. 

Cyclooctatetraene is readily displaced from its platinum complexes by o-donor ligands such as pyridine and triphenylphosphine. 

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... 

Platinum(O) and Pd(0) complexes containing one cyclooctatetraene and one 1,5-cyclooctadiene ligand ... 

Dichloro(l,5-cyclooctadiene)platinum(II) may be prepared from hexa-chloroplatinic acid, or by heating bis(benzonitrile)dichloroplatinum(II) in 1,5-cyclooctadiene at 14S°C for 5 min, or from potassium tetra-chloroplatinate(2-). The complex [PtCl2(CgHi2)] has a very low solubility in the reaction mixture and must be finely ground to ensure complete reaction. The olefins 1,5-cyclooctadiene, bicyclo[2.2.1]hept-2-ene(2-norbomeneX and 1,3,5,7-cyclooctatetraene and all solvents should be dried and freshly distilled under nitrogen. In particular, peroxide-free diethyl ether is first dried over sodium wire and then distilled under nitrogen from sodium-benzophenone. 

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