Cod Complex Research Articles

Synthesis and Reversible H2 Activation by Coordinatively Unsaturated Rhodium NHC Complexes

AbstractWe report the synthesis of coordinatively unsaturated cationic rhodium complexes bearing the sterically encumbered electron‐rich NHC ligand IPr*OMe. The COD (1,5‐cyclooctadiene) complex [Rh(IPr*OMe)(COD)]BF4 adopts a tilted, pseudo‐square planar coordination geometry, where bonding to the ipso‐carbon of the NHC aryl substituent was observed in the solid state. Hydrogenation of this complex afforded a metastable dihydride complex [Rh(IPr*OMe)(H)2]BF4 with an unusual internal coordination to an arene of the ligand. In the absence of a hydrogen atmosphere, spontaneous reductive elimination of H2 afforded a rhodium complex [Rh(IPr*OMe)]BF4 with a single chelating ligand that stabilizes the highly unsaturated metal by two‐fold π‐face donation as suggested by NMR spectroscopy and computational studies. This unusual complex might serve as a versatile precatalyst for a variety of transformations.

Syntheses and Catalytic Hydrogenation Performance of Cationic Bis(phosphine) Cobalt(I) Diene and Arene Compounds

AbstractChloride abstraction from [(R,R)‐(iPrDuPhos)Co(μ‐Cl)]2 with NaBArF4 (BArF4=B[(3,5‐(CF3)2)C6H3]4) in the presence of dienes, such as 1,5‐cyclooctadiene (COD) or norbornadiene (NBD), yielded long sought‐after cationic bis(phosphine) cobalt complexes, [(R,R)‐(iPrDuPhos)Co(η2,η2‐diene)][BArF4]. The COD complex proved substitutionally labile undergoing diene substitution with tetrahydrofuran, NBD, or arenes. The resulting 18‐electron, cationic cobalt(I) arene complexes, as well as the [(R,R)‐(iPrDuPhos)Co(diene)][BArF4] derivatives, proved to be highly active and enantioselective precatalysts for asymmetric alkene hydrogenation. A cobalt–substrate complex, [(R,R)‐(iPrDuPhos)Co(MAA)][BArF4] (MAA=methyl 2‐acetamidoacrylate) was crystallographically characterized as the opposite diastereomer to that expected for productive hydrogenation demonstrating a Curtin–Hammett kinetic regime similar to rhodium catalysis.

Syntheses and Catalytic Hydrogenation Performance of Cationic Bis(phosphine) Cobalt(I) Diene and Arene Compounds.

Chloride abstraction from [(R,R)-(iPr DuPhos)Co(μ-Cl)]2 with NaBArF 4 (BArF 4 =B[(3,5-(CF3 )2 )C6 H3 ]4 ) in the presence of dienes, such as 1,5-cyclooctadiene (COD) or norbornadiene (NBD), yielded long sought-after cationic bis(phosphine) cobalt complexes, [(R,R)-(iPr DuPhos)Co(η2 ,η2 -diene)][BArF 4 ]. The COD complex proved substitutionally labile undergoing diene substitution with tetrahydrofuran, NBD, or arenes. The resulting 18-electron, cationic cobalt(I) arene complexes, as well as the [(R,R)-(iPr DuPhos)Co(diene)][BArF 4 ] derivatives, proved to be highly active and enantioselective precatalysts for asymmetric alkene hydrogenation. A cobalt-substrate complex, [(R,R)-(iPr DuPhos)Co(MAA)][BArF 4 ] (MAA=methyl 2-acetamidoacrylate) was crystallographically characterized as the opposite diastereomer to that expected for productive hydrogenation demonstrating a Curtin-Hammett kinetic regime similar to rhodium catalysis.

Synthesis, Characterization of Phosphine, Phosphine Oxide and Amine Stabilized Platinum Nanoparticles in Organic Medium

Synthesis, Characterization of Phosphine, Phosphine Oxide and Amine Stabilized Platinum Nanoparticles in Organic Medium Synthesis of platinum nanoparticles (Pt-NPs) in organic medium is achieved by simple reduction method using Me2Pt (cod) complex as nanoparticle precursor and octadecylsilane as a reducing agent. These NPs are stabilized by organic ligands such as triphenylphosphine, triphenylphophine oxide and trioctylamine and the resulting NPs are characterized by UV-Vis spectroscopy, FTIR, XRD, TEM, SEM, XPS, TGA-DTG, ICP and NMR. The average diameters of the ligands stabilized Pt-NPs are in a range 1 to 3 nm. The influence of ligands on the long-term stability of NPs and their catalytic activity in the hydrosilylation of styrene are investigated.

Cationic Rhodium(I) Complex-Catalyzed Cotrimerization of Propargyl Esters and Arylacetylenes Leading to Substituted Dihydropentalenes

It has been established that a cationic rhodium(I)/cod complex catalyzes the cotrimerization of propargyl esters and arylacetylenes, leading to substituted dihydropentalenes, in the presence of excess cod through elimination of carboxylic acids.

On the economic application of DuPHOS rhodium(I) catalysts: a comparison of COD versus NBD precatalysts

The effectiveness of cyclooctadiene and norbornadiene precatalysts of the type [Rh(DuPHOS)(diolefin)]BF 4 in catalytic asymmetric hydrogenation of various prochiral olefins has been examined. In some of the systems studied, the NBD complex gave rise to the catalytically active species more rapidly than the corresponding COD complex, as expected. However, as catalyst loadings were reduced to levels more conducive to economic manufacture, the difference between the use of COD and NBD precatalysts became increasingly insignificant. This was conveniently highlighted by the formation of low enantiomeric excess products upon using an equimolar mixture of ( S, S) and ( R, R) precatalysts, bearing COD and NBD respectively. With other substrates, the system displayed no induction time for either precatalyst and identical reaction profiles were observed.

Enhanced Reactivity of 2-Rhodaoxetanes through a Labile Acetonitrile Ligand

New cationic, square-planar, ethene complexes [(Rbpa)RhI(C2H4)]+ [2 a]+–[2 c]+ (Rbpa= N-alkyl-N,N-di(2-pyridylmethyl)amine; [2 a]+: alkyl=R=Me; [2 b]+: R= Bu; [2 c]+: R= Bz) have been selectively oxygenated in acetonitrile by aqueous hydrogen peroxide to 2-rhoda(III)oxetanes with a labile acetonitrile ligand, [(Rbpa)RhIII(κ2-C,O-CH2CH2O−)(MeCN)]+, [3 a]+–[3 c]+. The rate of elimination of acetaldehyde from [(Rbpa)RhIII(κ2-C,O-CH2CH2O−)(MeCN)]+ increases in the order R=Me<R=Bu<R=Bz. Elimination of acetaldehyde from [(Bzbpa)RhIII(κ2-C,O-CH2CH2O)(MeCN)]+ [3 c]+, in the presence of ethene results in regeneration of ethene complex [(Bzbpa)RhI(C2H4)]+ [2 c]+, and closes a catalytic cycle. In the presence of Z,Z-1,5-cyclooctadiene (cod) the corresponding cod complex [(Bzbpa)RhI(cod)]+ [6c]+ is formed. Further oxidation of [3 c]+ by H2O2 results in the transient formylmethyl-hydroxy complex [(Bzbpa)RhIII(OH){κ1-C-CH2C(O)H}]+ [5 c]+.

Enhanced reactivity of 2-rhodaoxetanes through a labile acetonitrile ligand.

New cationic, square-planar, ethene complexes [(Rbpa)RhI(C2H4)]+ [2a]--[2c]+ (Rbpa = N-alkyl-N,N-di(2-pyridylmethyl)amine; [2a]+: alkyl =R=Me; [2b]+: R = Bu; [2c]+: R = Bz) have been selectively oxygenated in acetonitrile by aqueous hydrogen peroxide to 2-rhoda(III)oxetanes with a labile acetonitrile ligand, [(Rbpa)RhIII(kappa2-C,O-CH2CH2O-)(MeCN)]+, [3a]+-[3c]+. The rate of elimination of acetaldehyde from [(Rbpa)RhIII(kappa2-C,O-CH2CH2O-)(MeCN)]+ increases in the order R = Me< R = Bu< R = Bz. Elimination of acetaldehyde from [(Bzbpa)RhIII(kappa2-C,O-CH2CH2O)(MeCN)]+ [3c]+, in the presence of ethene results in regeneration of ethene complex [(Bzbpa)RhI(C2H4)]+ [2c]+, and closes a catalytic cycle. In the presence of Z,Z-1,5-cyclooctadiene (cod) the corresponding cod complex [(Bzbpa)RhI(cod)]+ [6c]+ is formed. Further oxidation of [3c]+ by H2O2 results in the transient formylmethyl-hydroxy complex [(Bzbpa)RhIII(OH)[kappa1-C-CH2C(O)H]]+ [5c]+.

New chiral α-aminophosphine oxides and sulfides: an unprecedented rhodium-catalyzed ligand epimerization

New chiral α-aminophosphine oxide N,P(O) and sulfide N,P(S) ligands have been prepared in one-pot syntheses by addition of Ph2PH to (S)-PhCHNCH(Ph)CH3, followed by oxidation with O2 or S8. Crystallization from cold methanol leads to the isolation of an enantiomerically pure single N,P(O) diastereomer and to a 1 : 1 mixture of the two N,P(S) diastereomers. The coordination chemistry of these ligands with [RhCl(COD)]2 and [RhCl(CO)2]2 has been investigated under argon and syngas. At high temperatures, a P–C oxidative addition of the N,P(O) ligand followed by imine elimination leads to several hydrido rhodium species. The complexes containing an N,P(S) ligand undergo the same process at room temperature. Catalytic amounts of the rhodium complexes catalyze the epimerization of the N,P(S) ligand under argon at room temperature, the dicarbonyl complex being 14 times more active than the COD complex. The same catalyzed epimerization takes also place for the N,P(O) ligand, but much more slowly, and only at 35 °C and under a syngas pressure. Possible mechanisms for this catalytic process are discussed. Catalytic tests in styrene hydroformylation have shown high activities and regioselectivities, but no enantioselectivity, for the N,P(O)-containing rhodium complexes.

Bay‐scale population structure in coastal Atlantic cod in Labrador and Newfoundland, Canada

Polymorphisms at five microsatellite DNA loci provide evidence that Atlantic cod Gadus morhua inhabiting Gilbert Bay, Labrador are genetically distinguishable from offshore cod on the north‐east Newfoundland shelf and from inshore cod in Trinity Bay, Newfoundland. Antifreeze activity in the blood suggests that Gilbert Bay cod overwinter within the Bay. Gilbert Bay cod are also smaller (weight and length) for their age and consequently less fecund for their age, than cod elsewhere within the northern cod complex. The productivity and recruitment potential of coastal cod off Labrador may thus be much lower than that of offshore northern cod or of inshore cod farther south, implying that a more conservative management strategy may be required for cod from coastal Labrador than traditionally practised for northern cod inhabiting less harsh environments. Relatively high FST and RST measures of population structure suggest that important barriers to gene flow exist among five components that include two inshore (Gilbert and Trinity Bay) and three offshore cod aggregations on the north‐east Newfoundland Shelf and the Grand Bank. DA and DSW estimates of genetic distance that involve Gilbert Bay cod are approximately three‐ and 10–fold larger, respectively, than estimates not involving Gilbert Bay cod. The differences between inshore cod from Gilbert Bay and Trinity Bay raise the possibility that other genetically distinguishable coastal populations may exist, or may have existed prior to the northern cod fishery collapse. Harvesting strategies for northern cod should recognize the existence of genetic diversity between inshore and offshore components as well as among coastal components.

Synthesis and structural characterization of Pd(II) and Pt(II) complexes with P-bonded 1′-(diphenylphosphino)ferrocenecarboxylic acid

The title hybrid phosphine ligand (Hdpf) coordinates to Pt(II) and Pd(II) as a monodentate phosphine. In the absence of deprotonating agents, its carboxyl group remains uncoordinated to metal, but takes part in various types of hydrogen bonding. Using K 2MCl 4 as the metal ion source, trans-square planar complexes of the M(Hdpf- P) 2X 2 type (MPd, XCl, Br; MPt, XCl) were obtained. While Pd(Hdpf- P) 2Cl 2 is formed also from Pd(cycloocta-1,5-diene)Cl 2, the analogous Pt(II)–cod complex provides cis-square planar Pt(Hdpf- P) 2Cl 2. The trans-chlorides behave inconsistently on recrystallization from carboxylic acids. While acetic acid gives single crystals of the solvates M(Hdpf- P) 2Cl 2·2 AcOH, propionic or formic acid does not form solvates with Pt(Hdpf- P) 2Cl 2 at comparable conditions. Single crystal X-ray structure determination of the last four complexes revealed remarkable differences in the conformation of the ferrocenyl moiety and in inter- and intramolecular hydrogen bonding. The two isostructural solvates have molecular arrangement with solvent molecules hydrogen-bonded to the carboxyl groups of the ligand, thus saturating their hydrogen-bond capability. As can be expected, the structure of the unsolvated trans-Pt(Hdpf- P) 2Cl 2 is that of a one-dimensional polymer linked by intermolecular hydrogen bonds. Finally, the cis-complex is dimeric in the crystal, being joined by pairs of the peripheral carboxyls; there is a further bonding π– π interaction between the phenyl groups of the cis-phosphines.

Synthesis and Characterization of Osmium(II) Compounds of Stoichiometry (C5Me5)OsL2Br, (C5Me5)OsL2H, and (C5Me5)Os(NO)Br2

The preparations of several new (pentamethylcyclopentadienyl)osmium(II) complexes from the osmium(III) compound (C5Me5)2Os2Br4 are described; among these are phosphine and alkene complexes of stoichiometry (C5Me5)OsL2Br and (C5Me5)OsL2H as well as the nitrosyl complex (C5Me5)Os(NO)Br2. Treatment of (C5Me5)2Os2Br4 with PPh3 in ethanol or PMe3 in dichloromethane affords the osmium(II) complexes (C5Me5)OsL2Br, where L = PPh3 or PMe3; the 1,5-cyclooctadiene complex (C5Me5)Os(cod)Br can be made similarly in ethanol. Treatment of either the PPh3 or cod complex with other tertiary phosphines in refluxing heptane affords several other compounds of this class: (C5Me5)OsL2Br, where L = PEt3, 1/2 Me2PCH2PMe2, 1/2 Me2PCH2CH2PMe2, or 1/2 Ph2PCH2PPh2. These bromoosmium(II) species serve as excellent starting materials for the preparation of other osmium(II) complexes. For example, treatment with NaBH4 in ethanol or with NaOMe in methanol affords the hydrides (C5Me5)OsL2H, where L = PMe3, PEt3, PPh3, 1/2 cod, 1/2 Me2PCH2PMe2, 1/2 Me2PCH2CH2PMe2, or 1/2 Ph2PCH2PPh2. Interestingly, treatment of (C5Me5)Os(PMe3)2Br with NaBH4 in refluxing ethanol affords the dihydride cation [(C5Me5)Os(PMe3)2H2+], which can be deprotonated with methyllithium in tetrahydrofuran to afford the electrically neutral hydride (C5Me5)Os(PMe3)2H. This hydride complex is expected to be one of the most basic transition metal complexes known. Finally, treatment of (C5Me5)2Os2Br4 with nitric oxide in dichloromethane yields the osmium(II) complex (C5Me5)Os(NO)Br2. IR, NMR, and mass spectra of the new complexes are described. A secondary 13C/12C isotope effect on the 31P NMR chemical shifts of ca. 0.025 ppm is noted in several compounds. Comparisons of these osmium(II) compounds with analogous ruthenium species suggests that the former have stronger metal−ligand bonds, are slower to undergo nucleophilic substitution reactions, and are stronger reducing agents.

Rhodium Complexes with the New Anionic Diphosphine [7,8-(PPh2)2-7,8-C2B9H10]-Ligand

New rhodium complexes with the eclipsed anionic diphosphine [7,8-(PPh2)2-7,8-C2B9H10]- are described. These were prepared from the neutral cod complex [Rh{7,8-(PPh2)2-7,8-C2B9H10}(cod)] either dire...

Kinetic Investigations of the Hydrogenation of Diolefin Ligands in Catalyst Precursors for the Asymmetric Reduction of Prochiral Olefins, II[1]

AbstractAsymmetric hydrogenations of prochiral olefines by means of chiral rhodium(I) complexes of the type [Rh(L)(PP*)]A (L = COD, [(Z,Z)‐cycloocta‐1,5‐diene], or NBD (norborna‐2;5‐diene), PP* = chiral bisphosphane forming seven‐membered chelate rings, A = anion like BF4−) are often associated with induction periods caused by partial blocking of the catalyst. NBD complexes are hydrogenated faster than the corresponding COD complexes. Catalytic hydrogenation of COD/NBD mixtures and the determination of the ratio of the Michaelis constants showed that the steady‐state concentration of the COD complex under hydrogen is higher than that of the NBD complex. However, under argon the NBD complex predominates owing to its higher thermodynamic stability compared with that of the COD complex as determined by 31P‐NMR spectoscopy. This complete reversion of the ther‐modynamically determined ratios of COD to NBD complex concentration under hydrogenation conditions was proven by means of UV/Vis spectroscopy.

Heterobimetallic indenyl complexes. Synthesis and structure of syn-[Cr(CO) 3(μ, η:η-indenyl)Rh(COD)

The heterobimetallic complex syn-[Cr(CO) 3(μ,η:η-indenyl)Rh(COD)] was obtained of syn-[Cr(CO) 3(μ,η:η-indenyl(Rh(CO) 2] with COD. The stereochemistry was retained in the exchange reaction as confirmed by 1H and 13C NMR measurements and by X-ray diffractometric analysis. In spite of great distortion, the COD complex is quite stable. An unusual bonding interaction between the hybrid CO orbitals of the Cr(CO) 3 group and the s-orbital of methine hydrogen atoms of COD is inferred on the basis of spectroscopic and X-ray structural data.

Synthesis, reactions and catalytic activities of cationic iridium(I) complexes of cycloocta-1,5-diene

New cationic iridium(I) complexes, [Ir(cod)(PPh3)L]ClO41[cod = cycloocta-1,5-diene; L = PhCN, PhCHCHCN, CH2CHCN, CH2C(Me)CN, MeCHCHCN or CH2CHCH2CN co-ordinated through the nitrogen atom], have been prepared by the reactions of [IrCl(cod)(PPh3)] with AgClO4 in the presence of L. Reaction of [Ir(cod)(PPh3)(PhCN)]ClO41a with H2 gives the cis-dihydridoiridium(III) complex [IrH2(cod)(PPh3)(PhCN)]ClO42a where the two hydrides are trans to PhCN and an olefinic group of cod, respectively. Complex 2a is stable both in solution and in the solid state at low temperature and decomposes at 15 °C to give cyclooctane and unidentified Ir–cod complex(es). The nitrile (L) in 1 is readily replaced by both PPh3 and CO, while cod is replaced only by CO. In the presence of complexes 1, unsaturated alcohols such as CH2CHCH2OH, CH2CHCH(Me)OH and CH2CHCH(Ph)OH rapidly undergo isomerization to the corresponding saturated carbonyl compounds at room temperature. Complex 1a catalyses the hydrogenation of unsaturated aldehydes, PhCHCRCHO (R = H, Me or Cl) to give PhCHCRCH2OH, PhCH2CHRCHO and PhCH2CHRCH2OH under H2(pH2= 6 atm) at 50 °C.

Detection of Intraspecific.DNA Sequence Variation in the Mitochondrial CytochromebGene of Atlantic Cod (Gadus morhua) by the Polymerase Chain Reaction

We determined the DNA sequence of a portion of the mitochondrial cytochrome b gene for 55 Atlantic cod (Gadus morhua) from Norway and from 10 locations within the Northern Cod complex and adjacent stocks off Newfoundland. DNA was prepared for sequencing by the polymerase chain reaction (PCR). Eleven variable nucleotide positions within a 298 base region defined 12 genotypes. Genotype proportions differed significantly between Newfoundland and Norwegian populations: the majority genotype among Newfoundland populations was present in a minority of Norwegian cod. Newfoundland cod showed less genotypic diversity than those from the eastern Atlantic: nine genotypes were found among all 10 Newfoundland populations, as compared with seven genotypes within the single Norwegian population. An exception was an overwintering, inshore Newfoundland population that showed four genotypes among five fish. As in other vertebrates, third position synonymous transitions predominate over other types of nucleotide changes. However, two amino acid replacement substitutions occur among cod, and the ratio of purine transitions to pyrimidine transitions is significantly higher than in other species. The existence of DNA sequence polymorphism permits the various hypotheses of the distribution and differentiation of Newfoundland cod stocks to be tested, and points to the utility of PCR technology in fishery genetics.

Unsaturated Bis(phosphido)‐bridged Heterobimetallic Polyhydrides via Dihydrogen Activation

AbstractHydrogenation (1 atm) of (PCy2)2Re(μ‐PCy2)2M(1,5‐COD) (M = Rh, Ir; Cy = cyclohexyl; COD = cyclooctadiene), (PCy2)2Re(μ‐PCy2)2Rh(DMPE) (DMPE = [Me2PCH2]2), [(PCy2)2ReH(μ‐PCy2)2Rh(DMPE)]BF4 and (PCy2)2ReH(μ‐PCy2)2Pd‐(PPh3) proceeds stepwise with initial additions of H2 across the Re = P multiple bonds to give ReH(PCy2H) moieties. Further addition of H2 occurs only for M = Rh. The DMPE complex gives the tetrahydride (PCy2H)2ReH3(μ‐PCy2)2RhH(DMPE), which loses PCy2H at 80 °C to give (PCy2H)ReH4(μ‐PCy2)2Rh(DMPE). Hydrogenation of the COD complex affords the stable hexahydride (PCy2H)ReH5(μ‐PCy2)2RhH(PCy2H) via the cyclooctenyl complex. (PCy2)2ReH(μ‐PCy2)2Rh(η3‐C8H13). While the hexahydride is an active homogeneous catalyst precursor for the hydrogenation of alkenes, dienes, and alkynes, attempts to activate the Re center for C‐H bond activation have not yet been successful. 31P and 1H DNMR spectroscopy have been used to investigate the solution dynamics of the heterobimetallic polyhydrides, and several X‐ray diffraction studies serve to define the solid state structures.

Synthesis and characterization of the rhodium tin mixed-metal alkoxides [((L2)Rh)2Sn(OEt)6], where L2 = 1,5-cyclooctadiene (COD) and (CO)2 and the conversion of the COD complex to Rh and SnO2 under mild conditions

Synthesis and characterization of the rhodium tin mixed-metal alkoxides [((L2)Rh)2Sn(OEt)6], where L2 = 1,5-cyclooctadiene (COD) and (CO)2 and the conversion of the COD complex to Rh and SnO2 under mild conditions

Chemistry of polynuclear metal complexes with bridging carbene or carbyne ligands. Part 98. Tri- and tetra-nuclear metal compounds with ethylidyne or p-tolylmethylidyne groups, and having both cyclopentadienyl and carbaborane ligands

The trimetal compounds [MWAu(µ-CR)(µ-CR′)(CO)4(η-C5H5)(η5-C2B9H9Me2)](M = Mo or W, R = R′= C6H4Me-4; M = W, R = R′= Me; R = Me, R′= C6H4Me-4) have been prepared by treating the complexes [MAuCl(µ-CR′)(CO)2(η-C5H5)](M = Mo or W, R′= C6H4Me-4; M = W, R′= Me) with the reagents [NEt4][W(CR)(CO)2(η5-C2B9H9Me2)](R = C6H4Me-4 or Me) in CH2Cl2 in the presence of TIBF4. The trimetal compounds react with [Pt(cod)2](cod = cyclo-octa-1,5-diene) or [Pt(PMe2Ph)2(nb)](nb = norbornene = bicyclo [2.2.1]heptene) to afford, respectively, the complexes [W2PtAu(µ-CC6H4Me-4)(µ3-CC6H4Me-4)(CO)4(cod)(η-C5H5)(η5-C2B9H9Me2)] and [MWPtAu(µ-CR′)(µ3-CR)(CO)4(PMe2Ph)2(η-C5H5)(η5-C2B9H9Me2)](M = W, R = R′= C6H4Me-4; R = Me, R′= C6H4Me-4; M = Mo, R = R′= C6H4Me-4). The cod complex was prepared by an alternative method, by treating [NEt4][WPt(µ-CC6H4Me-4)(CO)2(cod)(η5-C2B9H9Me2)] with [WAuCl(µ-CC6H4Me-4)(CO)2(η-C5H5)], in the presence of TIBF4. Addition of an excess of PMe2Ph in thf (tetrahydrofuran) to [W2PtAu(µ-CC6H4Me-4)(µ3-CC6H4Me-4)(CO)4(cod)(η-C5H5)(η5-C2B9H9Me2)] in the same solvent results in displacement of both cod and W(CC6H4Me-4)(CO)2(η-C5H6) groups, and formation of the trimetal complex [WPtAu(µ3-CC6H4Me- 4)(CO)2(PMe2Ph)3(η5-C2B9H9Me2)]. The i.r. and n.m.r. (1H and 13C-{1H}) data for the compounds are reported and discussed.