Tricarbonyl tungsten

Particularly interesting examples of mechanistic considerations can be found in the work of Graham [124-126], Schubert [127,128] and Crabtree [129]. Cophotolysis of hexamethylbenzenechrom- (or tungsten) tricarbonyl or Cp Mn(CO)3 with diphenylsilane yields, after cleavage of CO, a side-on coordinated silane with a M(H)Si 3c2e bond 30 [130, 131],... 

BFjMoCsH, Molybdenum, tricarbonyl-(ti5-cycl°Pent3d>enyl)[tetrafluoro-borato-(l -)]-, 26 96 0,BFjMoCkiH, Molybdenum(I + )tricar-bonyl(Ty-cyclopentadienyl)(Ti -ethene)-tetrafluoroborate(l-), 26 102 OiBF4WC H5, Tungsten, tricarbonyl (-rf-cyclopentadienyl)[tetrafluoroborato-(1-)]-, 26 96... 

The electrochemical oxidations of chromium and tungsten tricarbonyl complexes, respectively, were studied. 

C9H9NO cinnamamide, predominantly trans 621-79-4 489.83 42.908 2 16499 C9H9N303W triacetonitrile tungsten tricarbonyl 16800-47-8 307.15 25.714 1,2... 

NNaCioHi4, Boman-2-one, 3-sodium salt, 25 133 O3NSC7HS, o-BenzosuIfinide (saccharin) metal complexes, 23 47 O3N2S4WC13H20, Tungsten, tricarbonyl-bis(N,N-diethylcarbamodithioato)-, 25 157... 

P2RhC44H2j, Rhodium(I), carbonyl(4-methylbenzenesulfonato)bis(tricyclo-hexylphosphine)-, 27 292 O3P2WC21H44, Tungsten, tricarbonyl(dihy-drogen)bis(triisopropylphosphine)-, 27 7... 

PjOjWCwHm, Tungsten, tricarbonyl(dihy-drogen)bis(tricyclohexylphosphine)-, 27 6... 

There are several classic examples of the use of FTIR spectroelectrochemistry in elucidating the EC reactions of oxidized carbonyl complexes. These include the isomerization of 17e complexes for example, the isomerization of m-[Mo(CO)2(P-P)2]+ to the trans-isomer.139 Similarly, the cis-isomer of [Re(CO)2(P P)2]+ or [Re(CO)(P—P)2X] will isomerize on oxidation as monitored in a reflection IR cell.140 One-electron oxidation of [IrH(CO)(PPh3)3] is reversible, but further oxidation to the dication induces hydride oxidation and the appearance of bands due to the 16e complex [Ir(CO)(PPh3)3]+.141 Oxidation of arene tricarbonyls of Group 6 metals is frequently irreversible, especially in coordinating solvents at ambient temperature. However, the mesitylene tungsten tricarbonyl complex is oxidized by two electrons with the reversible take up of MeCN.142... 

WO2PC25H21, Tungsten, dicarbonyl(r -cyclopentadienyl)hydrido(triphenyl-phosphine)-, 26 98, 28 7 WOjCiqH, Tungsten, tricarbonyl(r -cycIo-heptatriene)-, 27 4... 

WC6H6(C0)3H Cyclopentadienyl-tungsten tricarbonyl, hydride, and derivatives, 7 136, 139 [WC5H5(CO)3]s Cyclopentadienyl-tungsten tricarbonyl, dimer, 7 139... 

Although Mo (II) and W(II) exhibit the most extensive seven-coordinate chemistry yet known (consistent with the application of the effective atomic number rule to these systems), a survey of the substituted metal carbonyl complexes of molybdenum and tungsten reveals no structural data for compounds of the type M(00)3(6-6)2 where 6-6 is a bidentate monoanionic ligand. No tungsten tricarbonyls of this type have been reported to date, but McDonald and co-workers have synthesized and studied the closely related W(CO)2(PPh3) (6-6)2 compounds where 6-6 is a chelating dithiocarbamate (7), xanthate, or dithiophos-phate (8). For molybdenum, the compounds Mo(CO)3(dtc)2(dtc = R2NCS2") (9) are examples of the M(CO)3(6-6)2 type as is Mo(CO)3-[S2P(i-Pr)2]2 (10), which has been well characterized in solution. 

Colton s work with the tricarbonylbisdithiocarbamatomolybdenum series (9) and McDonald s success in studying the triphenylphosphine-substituted tungsten analogs (8) led us to attempt the synthesis and characterization of an analogous tungsten tricarbonyl complex since ... 

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