Molybdenum, tricarbonyl

Fig. 7. Representive stmctures for compounds of molybdenum(0) (a) Mo(CO)g (b) tris(acetonitrile)tris(carbonyl)molybdenum(0) (c) bis(l,2-diphenylphosphinoethane) bis (dinitrogen) molybdenum(0), [R2PCH2CH2PR2]2Mo(N2)2, where R = CgH, also known as Mo(dppe)2(N2)2, where dppe = 1,2 — diphenylphosphinoethane (d) cyclopentadienyl tricarbonyl molybdenum(0) anion, CpMo(CO)3, where Cp = cyclopentadienyl (e)...

Some replacement reactions of l-chloroborepin(tricarbonyl)molybdenum 42 are summarized in Scheme 3, illustrating its utility as a precursor to certain derivatives 43-46, which may be unavailable directly from the corresponding borepin. Subsequent treatment of 45 with MgSC>4 in ether gave the corresponding 1,1 -bis[tricarbonyl(borepin)mo-lybdenum] oxide <19970M1884>. 

Chloroborepin and its tricarbonyl-molybdenum semi-sandwich complex are definitely planar and aromatic, as proved by X-ray diffraction (93AGE1065). However, electron-donor or sterically demanding substitution causes non-planarity of the seven-membered ring 1-dimethylaminoborepin was shown experimentally and theoretically to... 

The cyclopentadienyl tricarbonyl molybdenum and tungsten dimers also react with [(7r-Ph4C4)PdX2]2 (X = Cl, Br) complexes but by transfer of the tetraphenylcyclobutadiene group 182). 

Arene tricarbonyl molybdenum complexes are yellow, often crystalhne compounds. They are weakly air-sensitive in the sohd state and have to be stored under inert atmosphere and out of hght. They are best purified by crystaUization. In solution, they are unstable to air. The trait that has most hampered development of the use of (arene)Mo(CO)3 complexes in organic synthesis, however, is the lability of the arene metal bond. Lewis basic solvents such as THF, DMF, DM-SO, acetone and acetonitrile rapidly displace benzene in (benzene)Mo(CO)3. This lability of the arene-Mo bond, while making handling difficult, holds promise for the catalytic use of this class of compounds. 

Mechanism of Fluxional Rearrangement in Cyclooctatetraene tricarbonyl-molybdenum. A Random Process via a Symmetrical Transition State, F. A. Cotton, D. L. Hunter, and P. Lahuerta, J. Amer. Chem. Soc., 96,4723 (1974). 

Polysilanes have also been complexed with metal carbonyls. Tricarbonyl-molybdenum groups were introduced into poly(methylphenylsilane) upon treatment with Mo(CO)3Py3. ... 

Treatment of Cp"Cr(Ti -Cot), Cp" = Cp, Cp with (EtCN)3M(CO)3, M = Mo, W and Fe2(CO)9 affords the complexes [(Cp Cr)(CO)3M][ i-Cot], M = Fe, Cr, W, Cp = Cp and I(Cp Cr)(CO)3Crl/i-Cot, Cot = Cyclooctatetrane, which have been spectroscopically characterised. Bimetallic complexes containing bis(tetramethylcyclopentadienyl) dimethylsilane bridges have been prepared from the reaction of arene tricarbonyl molybdenum complexes with the silyl substituted cyclopentadienyl derivative. The synthesis of pinanylcyclopentadienes followed by metallation and reaction with Mo(CO)s and Mel gives the chiral (-)-[(ii -C5Me4-3-pinanyl)(CO)3Me], which has been structurally characterised. The chiral methallyl complexes CpMo(NO)X(Ti -2-methallyl) X = camphorsulfonate have been resolved and the reactions of the... 

C3iH29Cl3NbP2 2 C7H8, [1,2-Bis(diphenylphosphino)ethane]trichloro-(Tj -cyclopentadienyl)niobium(IV) bistoluene solvate, 45B, 983 C3 2H2oAgBF, 14O12W4, Tetrakis(cyclopentadienyliodotungsten-tricarbon-yDsilver tetrafluoroborate, 43B, 1090 C3 2H2oHg4MOaOi2, (T -Cyclopentadienyl-tricarbonyl-molybdenum)-mercury-molybdenum tetramer, 45B, 984... 

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