14917-12-5Relevant articles and documents
31p chemical shift anisotropies of trimethyl- and triphenylphosphine- substituted group 6 metal pentacarbonyl complexes
Wosnick, Jordan H.,Morin, Frederick G.,Gilson, Denis F.R.
, p. 1280 - 1283 (1998)
The 31P chemical shift tensor components and anisotropies of the trimethyl- and triphenylphosphine complexes of the group 6 metal pentacarbonyls, M(CO)5PR3 (M = Cr, Mo, W and R = Me, Ph), have been measured using solid-sta
Photoinduced coupling of CO and vinylidene ligands-formation of cyclobutane-1,3-diones
Abd-Elzaher, Mokhles M.,Weibert, Bernhard,Fischer, Helmut
, p. 1050 - 1052 (2005)
Photolysis of pentacarbonyl vinylidene complexes of chromium and tungsten affords cyclobutane-1,3-dione derivatives, whereas thermolysis yields binuclear vinylidene nonacarbonyl complexes. In contrast to vinylidene complexes, photolysis of the diphenylall
Kinetic studies of the cleavage of M+- (M+ = Na+, PPN+; M' = Cr, W; M'' = Mn, Re; L = CO, PR3)
Park, Yong K.,Kim, Seon J.,Kim, Jin H.,Han, In S.,Lee, Chang H.,Choi, Hyung S.
, p. 193 - 202 (1991)
Heterobimetallic complexes have a donor-acceptor metal-metal bond in which two electrons from the electron rich metal moiety are donated to the other electron-deficient metal moiety.The heterobimetallic species of interest, M+- (M+ = Na+, PPN+; M' = Cr, W; M'' = Mn, Re; L = CO, PR3) undergoes ligand substitution or metal-metal bond cleavage upon reaction with PR3 (R = C6H5, C2H5) or CO.Unprecedented reactions by the counter ion were observed.Factors affecting these dimeric disruptions will be discussed on the basis of the kinetic studies.
UEBERGANGSMETALL-CARBIN-KOMPLEXE. LXXV. SYNTHESE NEUER HALOGENVERBRUECKTER ZWEIKERNIGER CARBINKOMPLEXE VON CHROM UND WOLFRAM
Fischer, Ernst Otto,Wanner, Juergen Karl Roman
, p. 175 - 180 (1983)
Irradiation of hexacarbonyl chromium in dichloromethane at low temperature yields an intensely yellow solution, in which the presence of "Cr(CO)5(CH2Cl2)" is supposed.After addition of carbyne complexes of chromium or tungsten to these solutions the new h
Phillips, Julia R.,Trogler, William C.
, p. 633 - 638 (1992)
Fischer, E. O.,Louis, E.,Bathelt, W.,Moser, E.,Mueller, J.
, p. P9 - P12 (1968)
Unprecedented allenylidene transfer from chromium to tungsten
Szesni, Normen,Drexler, Matthias,Fischer, Helmut
, p. 3989 - 3995 (2008/10/09)
Pyrimidylallenylidene complexes 1 ([(CO)5M=C=C=C(NC 3H3NEt)]; M = Cr (a), W (b)) were prepared in a one-pot procedure from readily available 2-ethynylpyrimidine, butyllithium, [(CO) 5M-(THF)], and triethyloxonium tetrafluoroborate. In addition to 1a,b, the homobinuclear allenylidene complexes 2a,b ([(CO)5M=C=C= C(NC3H3NEt)M(CO)5]; M = Cr, W) were formed. In 2a,b the second (CO)5M moiety is attached to the nonalkylated nitrogen atom of the pyrimidyl ring. Treatment of the chromium complex la with an excess of [(CO)5W(THF)] afforded the tungsten allenylidene complex 2b by transmetalation of the allenylidene ligand and addition of (CO) 5W. The allenylidene ligands of other chromium allenylidene complexes [(CO)5Cr=C=C=C(R1)R2] could likewise be transferred to tungsten. In contrast, the reverse transmetalation from tungsten to chromium could not be achieved. DFT calculations indicate that the reaction proceeds by an associative rather than a dissociative pathway. The initiating reaction step is coordination of a (CO)5W fragment to the C α-Cβ bond of the allenylidene ligand.
Synthesis and structure of heterobimetallic compounds with a single thiolato-bridged ligand
Hossain, Md. Munkir,Lin, Hsiu-Mei,Shyu, Shin-Guang
, p. 2655 - 2659 (2007/10/03)
Reactions between CpFe(CO)2SPh and M(CO)5THF (M = Cr, Mo, and W) in a mixture of benzene and THF at room temperature afforded compounds of the type CpFe(CO)2(μ-SPh)M(CO)5 (1) [M = Cr (1a), Mo (1b), and W (1c)] in high yield. However, migration of the thiolato ligand occurred during reactions between CpM(CO)xSPh (M = Fe, x = 2; M = Mo and W, x = 3) and Fe2(CO)9 forming compounds [Fe(μ-SPh)(CO)3]2 and [CpM(CO)x]2 (M = Fe, x = 2; M = Mo and W, x = 3). Single-crystal X-ray diffraction analyses reveal that 1c is a single thiolato-bridged hererobimetallic compound without a metal-metal bond. Metal-metal bond formation in compounds 1 by decarbonylation under thermal or photolytic condition was not observed. Reactions between compounds 1 and PPh3 produced CpFe(CO)2SPh and PPh3M(CO)5 (M = Cr, Mo, and W) by M-S bond cleavage in 1.
