12128-23-3Relevant articles and documents
Comparative Photochemistry of Tricarbonyl(η5-cyclopentadienyl)methyl- and -ethyl-molybdenum and -tungsten in Poly(vinyl chloride) Film Matrices at 12-298 K
Hooker, Richard H.,Rest, Antony J.
, p. 761 - 770 (1984)
The photoreactions of 5-C5H5)(CO)3(CH3)> and 5-C5H5)(CO)3(C2H5)> complexes (M = Mo or W) in poly(vinyl chloride) (pvc) film matrices over a wide temperature range have been monitored using i.r. spectroscopy.At 298 K the methyl complexes dealkylate on irradiation (λ > 300 nm) to form 5-C5H5)(CO)3Cl>, 5-C5H5)(CO)3H>, and 5-C5H5)2(CO)6>.Photolysis at 12 K leads primarily to the formation of 5-C5H5)(CO)2(CH3)>.In the case of molybdenum, M-CH3 bond cleavage also occurs at 12 K and the complexes 5-C5H5)(CO)3Cl> and 5-C5H5)(CO)3H> are generated on warming the matrices.Photolysis of 5-C5H5)(CO)3(C2H5)> at 12 K proceeds with the formation of 5-C5H5)(CO)2(C2H5)> which rearranges photochemically or thermally to form trans-5-C5H5)(CO)2(C2H4)H>.The cis-ethylene-hydride complex is also observed for tungsten at temperatures below ca. 50 K.At 298 K, photolysis of 5-C5H5)(CO)3(C2H5)> leads directly to trans-5-C5H5)(CO)2(C2H4)H> which reacts further to form 5-C5H5)(CO)3H>, 5-C5H5)(C0)2(C2H4)Cl>, 5-C5H5)(CO)3Cl>, and 5-C5H5)2(CO)6>.However, on photolysis of 5-C5H5)(CO)3(C2H5)> at 298 K the main product observed is with trace amounts of 5-C5H5)(CO)3H>, 5-C5H5)(CO)3Cl>, and 5-C5H5)2(CO)6>.
Reactivity of the metallophosphines (Cp = η-C5H5, M = Mo, W) towards alkynes. X-Ray crystal structure of >
Adams, Harry,Bailey, Neil A.,Day, Andrew N.,Morris, Michael J.,Harrison, Mary M.
, p. 247 - 258 (1991)
The mononuclear phosphido complexes (Cp = η-C5H5; M = Mo, W) react with the electron deficient alkynes methyl propiolate (HCCCO2Me) and dimethyl acetylenedicarboxylate (DMAD, MeO2CCCCO2Me) to give the metallacyclic complexes 1=C(R2)CO)> (R1 = H, CO2Me; R2 = CO2Me), which contain a five-membered chelate ring formed by the linking of the phosphido group, the alkyne, and one CO ligand.The molybdenum phosphido complex, though not the tungsten, also reacts with phenylacetylene to give the corresponding metallacycle , which has been characterized by a single crystal X-ray structure determination.This complex can also be produced by the action of PPh2Cl on the dinuclear μ-acetylide LiCPh)(CO)4>.
Bi- and triheteronuclear complexes of uranium and group VI transition metals
Dormond, Alain,Moise, Claude
, p. 595 - 598 (2008/10/08)
The new heterobimetallic compounds Cp3U[OCM(CO)2Cp′] containing uranium and group VI transition metals are synthesized from Cp3UCl and Na[M(CO)3Cp′] or from Cp3UCH3 and H[M(CO)3Cp′] (M = Mo, W; Cp = C5H5; Cp′ = C5H5 or C5Me5). In a same manner, the trimetallic Cp2U[OCMo(CO) 2Cp]2 is obtained starting from Cp2U(NEt2)2 and H[Mo(CO)3Cp]. All these complexes exhibit low CO stretching frequencies characteristic of isocarbonyl linkages between uranium and Mo or W atoms.
