共查询到20条相似文献,搜索用时 15 毫秒
1.
Michael P. Doyle William H. Tamblyn William E. Buhro Roberta L. Dorow 《Tetrahedron letters》1981,22(19):1783-1786
Hexadecacarbonylhexarhodium exhibits exceptional activity as a cyclopropanation catalyst in reactions between ethyl diazoacetate and alkenes that are remarkably free of competing processes. 相似文献
2.
3.
I. V. Fedoseev N. S. Gerasimova A. Yu. Loginova 《Russian Journal of Inorganic Chemistry》2010,55(2):186-189
Heteronuclear clusters of general formula [PtxPdy(CO) z] were synthesized by reaction of CO with PtCl4 + PdCl2 solutions in 95% ethanol at room temperature and atmospheric pressure. The products isolated were analyzed by IR spectroscopy,
thermogravimetry, and X-ray powder diffraction. 相似文献
4.
5.
6.
The rate of CO insertion for the following complexes have been determined: RCH2Mn(CO)5 where R cyclohexyl, hydrogen, phenyl, methoxy, and carboxyl; RCH2Fe(CO)4? where R cyclohexyl, n-octyl, n-heptyl, and phenyl. It appears that a Taft σ? correlation can be established for this reaction. Rate data for the decarbonylation reaction of an analogous series of substituted manganese carbonyl complexes (RCH2COMn(CO)5) was also obtained. As in the case of the CO insertion reaction, the rates increase as the Taft σ for RCH2 decreases.The linear free energy relationships (LFER) generated in this study have been used to predict the relative probability of several reaction steps that have been postulated for the conversion of carbon monoxide and hydrogen into ethylene glycol. 相似文献
7.
Summary In the determination of conformations in accordance with the largest substituents it is found that compound (IV) has the conformations trans-ee and trans-aa and compound (V) the conformations cis-ae and cis-ea; none of these conformations predominates substantially, as with neither of the two possible conformations of the compound (III). 相似文献
8.
Summary The XAsFe4(CO)14 (X = Cl, Br) clusters have been prepared and characterised and a new synthesis under mild conditions has been found for As2Fe3(CO)9. The latter complex has at least two isomeric structures in solution.A preliminary account of this work was given in a lecture.The terms pnicogen and pnictide have been introduced as group names for the group Va family of elements analogous to the use of chalcogen and chalcogenid as group names for the group VIa elements. 相似文献
9.
10.
11.
12.
Brian F.G. Johnson Jack Lewis David Pippard 《Journal of organometallic chemistry》1978,160(1):263-274
Methods by which the reactivity of transition-metal osmium carbonyl clusters may be modified are explored. 相似文献
13.
The NMR and infrared spectra of a series of carboxylic acids of carbonyl fluoride telomers, CF3O(CF2O)nCF2COOH (with n = 1 through 7) are described and tentative assignments for the main vibrational modes proposed. 相似文献
14.
Kettle SF Boccaleri E Diana E Iapalucci MC Rossetti R Stanghellini PL 《Inorganic chemistry》2002,41(14):3620-3627
The spherical harmonic model (SHM), previously used for the analysis of the terminal nu(CO) vibrations of transition metal carbonyl clusters, is applied to the corresponding bridging CO modes. The model is applicable, although the spectra show a greater sensitivity to the molecular geometry than is the case for their terminal counterparts. The reasons for this sensitivity are discussed. When both micro(2) and micro(3) CO groups are present in a molecule, a spectral distinction may not be apparent. 相似文献
15.
R. P. Bahuguna Y. C. Joshi M. P. Dobhal R. K. Pande B. C. Joshi 《Journal of heterocyclic chemistry》1982,19(4):957-960
Synthesis and spectral studies (ir, 1H nmr, ms) of 1- and 3-substituted arylthiobenzo[f]quinolines (IIIa-IIIc, IVa-IVc) obtained through nucleophilic displacement of the corresponding halobenzo[f]quinoline by various thiols (a-c) were done. 相似文献
16.
Michael I. Bruce Natasha N. Zaitseva Brian W. Skelton 《Journal of organometallic chemistry》2008,693(17):2887-2897
Several complexes containing Co3 carbonyl clusters end-capping carbon chains of various lengths are described. Pd(0)/Cu(I)-catalysed reactions between {Co3{μ3-C(CC)2Au(PPh3)}(μ-dppm)(CO)7 and I(CC)2SiMe3 or FcCCI gave {Co3{μ3-C(CC)xR}(μ-dppm)(CO)7 [x = 4, R = SiMe33; x = 3, R = Fc 8]; treatment of 3 with NaOMe and AuCl(PPh3) gave 4 [x = 4, R = Au(PPh3)]. Related preparations of Co3{μ3-C(CC)2[Ru(PP)Cp′]}(μ-dppm)n(CO)9−2n [PP = (PPh3)2, Cp’ = Cp, n = 1, 5; PP = dppe, Cp′ = Cp∗, n = 1, 6; 0, 7] are also described. Syntheses of bis-cluster complexes {Co3(μ-dppm)(CO)7}2(μ-Cx) (x = 14, 12; 16, 9; 18, 11; 26, 10) - the latter being the longest cluster-capped Cx chains so far described - and the mercury-bridged compounds Hg{(CC)xC[Co3(μ-dppm)(CO)7]}2 (x = 1, 13; 2, 14) are reported. The molecular structures of 7, 12, 13 and 14, as well as of Co3(μ3-CCCSiMe3)(μ-dppm)(CO)6(PPh3) (15) and Co3{μ3-CC(O)OEt}(μ-dppm)(CO)7 (16), are reported. 相似文献
17.
18.
The historical background of and the incentive for using ruthenium carbonyl clusters as homogeneous catalysts are outlined.
Keeping in view the possible solutions the uncertainties arising from declusterification and metal colloid formation are discussed.
All ruthenium cluster-catalysed reactions are broadly classified as reactions with or without carbon monoxide as one of the
reactants and the basic differences between such reactions are highlighted. Some of the factors of special relevance to cluster-catalysed
reaction systems are mentioned. The reactions involving carbon monoxide are then discussed. These include water-gas-shift
reaction, carbon monoxide hydrogenation, hydroformylation, reductive carbonylation of nitrobenzene and other carbonylation
reactions. Hydrogenation, transfer hydrogenation, isomerisation and a few other reactions are then discussed. For all these
reactions, special emphasis is laid on well-characterised cluster complexes that have been proposed as catalytic intermediates.
Finally an attempt has been made to identify the path that future research in cluster catalysis is likely to follow. 相似文献
19.
Simon R. Drake Brian F. G. Johnson Jack Lewis 《Journal of organometallic chemistry》1988,340(3):C31-C36
The heteronuclear clusters [Os10C(CO)24(MPR3nm− (n = 1, m = 1; 2: M = Au; 3: M = Ag; 4: M = Cu; 5 n = 2, m = 0, M = Ag) have been prepared. These clusters undergo molecular rearrangements in solution, and two isomeric forms of 2, 3, 4, 5 and 6 have been identified. This interconversion is thought to involve a cap [lrarr2] edge bridge [lrarr2] cap pathway. 相似文献
20.
Preparation of monosubstituted thiourea complexes of molybdenum carbonyl [Mo(CO)5L] both by thermal and UV irradiation methods have been described. The ligands (L) used were N,N′-dimethylthiourea (DMTU), N,N′-diphenylthiourea (DPTU), tetramethylthiourea (TMTU) and tetraethylthiourea (TETU). The complexes [Mo(CO)5(L)] were characterised by NMR, IR, UV-visible and elemental analyses. 相似文献