W Fe, Ru, and Os

Mo and W Fe, Ru, Os - The reactions of [M(C0)4(T -NBD)] (M = Cr, Mo) with N,N-bis-[o-(diphenylphosphino)benzylidene]ethylenedianiine have been reportedl39. Reaction of [WBr2(CO)2(T) -NBD)] with C5H5-, Me(X)2 , MeC(S)0 and C6F5S resulted in replacement of bromide with concomitant formation of 6- or 7-coordinated mono- or disubstituted derivatives. The X-ray crystal structure of the product [WBr(SC6F5)(CX))2(Tl -NBD)] was reported . 

Rh and Ir - The synthesis, properties and reactions of (T]5-bicyclo[3.2.01hcpta-l,3-dienyl)(il -COD)cobalt(I) have been reported, including the X-ray crystal structure of the tetraphenylcyclobutadiene complex, (17), the product of its reaction with diphenylethyne. The reaction of [(Ti5-C5H4R)Co( n -COD)] with 1,6-cyclodecadiyne afforded the (q. C5H4R)cobalt-capped cyclobutadiene superphane. The yield of the reaction was reported to vary with the substituent R. 

The X-ray crystal structure of [(C6o) Ir2Cl2(r -COD)2)2]. where the two iridium moieties were found to coordinate to the same six-membered ring of the fullerene species, has been determined .  

The reaction of the tetiafluorobenzobarrelene compounds [IrH2(SiR3)(TFB)(PCy3)], 

The electron-transfer reactions from the palladium(0) cenme to the cotndinated quinone in [Pd(ii -COD)(l,4-quinone)] compounds have been studied. Addition of acid was found to initiate a redox reaction to afford a palladium(II) diene compound and hydroquinone. In some cases, further reacticm to give oxypalladated derivatives was observed. 

Mo and W Fe, Ru and Os The reaction of norbomadiene(tetracarbonyl)-chromium and -tungsten with aryUithium reagents and subsequent alkylation afforded the dialkene-caibene complexes [M( n -C7Hg)(CO)3(=C(OEt)Ar)], stmcturally characterised for M = Cr and Ar = 4-CH3C6H4. 

The microwave rotational spectrum of [Fe(CO)3(T] -C4H6)] has been measured and used to calculate the geometical parametras in the molecule . The surprisingly robust salt [Ru(T - 

The synthesis and X-ray crystal structures of two iron norbomadiene complexes of the type [Fe(CO)2(T -NBD)(L)] (L = CNMe, PPh3) has been reported206. When L = NCMe, the coordination about the iron was found to be essentially trigonal bipyramidal with the axial positions occupied by CNMe and one C=C bond. When L = PPh3, the coordination geometry was found to be close to square pyramidal, with an axial CO ligand. The relevance of these stractures to rotation of the diene in [Fe(CO)3(Ti -diene)] complexes was discussed. 

The scope and mechanism of the reactions of [CpFe(ii -COD)][Li(TMEDA)] (TMEDA = Me2NCH2CH2NMc2) with a number of organic monohalides and geminal dihalides has been investigated O .  

The enthalpies of reaction of [Cp Ru(ti4.C0D)Cl] with a series of bidentate tertiary phosphine ligands to yield [Cp Ru(PP)Cl] (PP = dppm, dmpm, dppe, dppp, depe) have been measured by anaerobic solution calorimetry. Comparison of the enthalpies of reaction with those of monodentate phosphine ligands afforded a quantitative treatment of ring strain energies in the 

The electrochemical behaviour and X-ray crystal structure of the unusual dimeric ruthenium(II) cyclooctadiene complex, [(tri-p-chloro)(chloro)(acetonitrile)bis(T -cyclooctadiene)diruthenium(II)] have been reported f . 

The reaction of of [Cp RuCl(ii4-COD)] with [AgBp4] affordedZiO [Cp RuCl(ii4-C0D)] [BF4] which underwent skeletal rearrangement of the coordinated noibcamadiene initiated by C(l)-C(2) bond cleavage to form a 6-methylfulvalene complex [Cp RuCl(C5H4CHCH3)]+[BF4]-. 

---