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1.
The dimethylphosphino substituted cyclopentadienyl precursor compounds [M(C 5Me 4CH 2PMe 2)], where M=Li + (1), Na + (2), or K + (3), and [Li(C 5H 4CR′ 2PMe 2)], where R′ 2=Me 2 (4), or (CH 2) 5 (5), [HC 5Me 4CH 2PMe 2H]X, where X −=Cl − (6) or PF 6− (7) and [HC 5Me 4CH 2PMe 2] (8), are described. They have been used to prepare new metallocene compounds, of which representative examples are [Fe(η-C 5R 4CR′ 2PMe 2) 2], where R=Me, R′=H (9); R=H and R′ 2=Me 2 (10), or (CH 2) 5 (11), [Fe(η-C 5H 4CMe 2PMe 3) 2]I 2 (12), [Fe{η-C 5Me 4CH 2P(O)Me 2} 2] (13), [Zr(η-C 5R 4CR′ 2PMe 2) 2Cl 2], where R=H, R′=Me (14), or R=Me, R′=H (15), [Hf(η-C 5H 4CMe 2PMe 2) 2]Cl 2] (16), [Zr(η-C 5H 4CMe 2PMe 2) 2Me 2] (17), {[Zr(η-C 5Me 4CH 2PMe 2) 2]Cl}{(C 6F 5) 3BClB(C 6F 5) 3} (18), [Zr{(η-C 5Me 4CH 2PMe 2) 2Cl 2}PtI 2] (19), [Mn(η-C 5Me 4CH 2PMe 2) 2] (20), [Mn{(η-C 5Me 4CH 2PMe 2B(C 6F 5) 3} 2] (21), [Pb(η-C 5H 4CMe 2PMe 2) 2] (23), [Sn(η-C 5H 4CMe 2PMe 2) 2] (24), [Pb{η-C 5H 4CMe 2PMe 2B(C 6F 5) 3} 2] (25), [Pb(η-C 5H 4CMe 2PMe 2) 2PtI 2] (26), [Rh(η-C 5Me 4CH 2PMe 2)(C 2H 4)] 29, [M(η,κ P-C 5Me 4CH 2PMe 2)I 2], where M=Rh (30), or Ir, (31). 相似文献
2.
While each of the three organosamarium(III) title complexes: [Cp 2Sm{μ-OC 10H 19}] 2 (5; Cp = C 5H 5, OC 10H 19 = isomenthoxide), [Cp 2Sm{μ-OCH(Me)COO iBU}] 2 (6) and [Cp 3SmOS(Me)- p-C 6H 4Me] (7) contains a chiral ligand atom (i.e. C or S) next to the metal-bonded oxygen atoms, only the dinuclear compounds 5 and, even better, 6 display (below ca. 600 nm) significant circular dichroism of discrete f---f-crystal field transitions. According to a successful single-crystal X-ray study of 5, the cyclohexyl ring of its (1S,2R,5R)-isomenthoxide ligand adopts a conformation with axial OSm- and iPr-substituents, which is energetically less favourable at least for neat (1S,2R,5R)-isomenthol. ZusammenfassungObwohl jeder der drei neuen Organosamarium(III)-Komplexe: [Cp2Sm{μ-OC10OH19}]2 (5; Cp = C5H5, OC10H19 = Isomentholat), [Cp2Sm{μ-OCH(Me)COOiBU}]2 (6) und [Cp3SmOS(Me)-p-C6H4Me] mindestens ein chirales Ligandenatom (C oder S) unmittelbar am metallkoordinierten O-Atom enthält, zeigen nur die dimeren Systeme 5 und noch ausgeprägter 6 (unterhalb von ca. 600 nm) signifikanten Circulardichroismus von f---f-Kristallfeldübergängen des Sm3+-Ions. Auf Grund einer erfolgreichen Kristallstrukturanalyse von 5 liegt der Cyclohexylring des (1S,2R,5R)-Isomentholatliganden ausschließlich in der Konformation mit axialen OSm- und iPr-Substituenten vor, die für freies (1S,2R,5R)-Isomenthol energetisch deutlich unvorteilhafter ist. 相似文献
3.
The reaction of the metallocene dichlorides Cp 2MCl 2 (Cp = η 5-C 5H 5; M = Ti, Zr, Hf, Mo, W) and Cp 2′TiCl 2 (Cp′ = η 5-C 5H 4CH 3) with equimolar amounts of dilithium-benzene- o-diselenolate, 1,2-(LiSe) 2C 6H 4, gives the chelate complexes Cp 2M(Se 2C 6H 4) (M = Ti (I), Zr (II), Hf (III), Mo (IV), W (V)) and Cp 2′Ti(Se 2C 6H 4) (VI). CpTiCl 3 reacts with 1,2-(LiSe) 2C 6H 4 to give CpTiCl(Se 2C 6H 4) (VII). The ring inversion activation parameters for I–VI can be determined by means of temperature-dependent 1H NMR spectroscopy in solution. The fragmentation behaviour of I–VII in the mass spectrometer has been investigated by pursuing metastable transitions, using linked-scan techniques. 相似文献
4.
硅桥连双(三甲硅基环戊二烯基)双锂盐与TiCl 4·2THF反应,生成相应的钛化合物[E(C 5H 3SiMe 3) 2]TiCl 2[E=Me 2SiSiMe 2(3),Me 2SiOSiMe 2(5)],同时还分离到了脱一个三甲硅基的产物[E(C 5H 4)(C 5H 3SiMe 3)]TiCl 2[E=Me 2SiSiMe 2(4),Me 2SiOSiMe 2(6)].其中四甲基二硅氧桥连配体更容易发生这种脱硅基反应.通过元素分析、MS和 1HNMR谱表征了化合物3-6的分子结构. 相似文献
5.
The reactions of RNHSi(Me) 2Cl (1, R= t-Bu; 2, R=2,6-(Me 2CH) 2C 6H 3) with the carborane ligands, nido-1-Na(C 4H 8O)-2,3-(SiMe 3) 2-2,3-C 2B 4H 5 (3) and Li[ closo-1-R′-1,2-C 2B 10H 10] (4), produced two kinds of neutral ligand precursors, nido-5-[Si(Me) 2N(H)R]-2,3-(SiMe 3) 2-2,3-C 2B 4H 5, (5, R= t-Bu) and closo-1-R′-2-[Si(Me) 2N(H)R]-1,2-C 2B 10H 10 (6, R= t-Bu, R′=Ph; 7, R=2,6-(Me 2CH) 2C 6H 3, R′=H), in 85, 92, and 95% yields, respectively. Treatment of closo-2-[Si(Me) 2NH(2,6-(Me 2CH) 2C 6H 3)]-1,2-C 2B 10H 11 (7) with three equivalents of freshly cut sodium metal in the presence of naphthalene produced the corresponding cage-opened sodium salt of the “carbons apart” carborane trianion, [ nido-3-{Si(Me) 2N(2,6-(Me 2CH) 2C 6H 3)}-1,3-C 2B 10H 11] 3− (8) in almost quantitative yield. The reaction of the trianion, 8, with anhydrous MCl 4 (M=Ti and Zr) in 1:1 molar ratio in dry tetrahydrofuran (THF) at −78 °C, resulted in the formation of the corresponding half-sandwich neutral d 0-metallacarborane, closo-1-M[(Cl)(THF) n]-2-[1′-η 1σ-N(2,6-(Me 2CH) 2C 6H 3)(Me) 2Si]-2,4-η 6-C 2B 10H 11 (M=Ti (9), n=0; M=Zr (10), n=1) in 47 and 36% yields, respectively. All compounds were characterized by elemental analysis, 1H-, 11B-, and 13C-NMR spectra and IR spectra. The carborane ligand, 7, was also characterized by single crystal X-ray diffraction. Compound 7 crystallizes in the monoclinic space group P2 1/ c with a=8.2357(19) Å, b=28.686(7) Å, c=9.921(2) Å; β=93.482(4)°; V=2339.5(9) Å 3, and Z=4. The final refinements of 7 converged at R=0.0736; wR=0.1494; GOF=1.372 for observed reflections. 相似文献
6.
Reaction of the incompletely condensed silsesquioxane derivative Cy 7Si 7O 9(OH) 3 (1) with Ti(OEt) 4 affords the dimeric titanasilsesquioxane [(Cy 7Si 7O 12)Ti(μ-OEt)(EtOH)] 2 (13) in 81% yield. The known titanasilsesquioxane [Cy 7Si 7O 11(OSiMe 3)] 2Ti (18) has been prepared through a modified procedure starting from titanium tetraalkoxides. Novel oxotitanium silsesquioxane derivatives are obtained from reactions of titanocene dihalides with Cy 7Si 7O 9(OH) 2(OSiMe 3) (14). Cp 2TiCl 2 yields dinuclear (μ-O)[{Cy 7Si 7O 11(OSiMe 3)}TiCp] 2 (19), while with Cp *2TiCl 2 the trinuclear titanacycle Cp *2Ti 3O 3[Cy 7Si 7O 11(OSiMe 3)] 2 (20) is obtained. In addition, a new synthetic route to model compounds for titanium catalysts immobilized on silica has been developed. Disilylated Cy 7Si 7O 9(OH)(OSiMe 3) 2 (15) cleanly reacts with the ‘tucked-in’ fulvene complex Cp*Ti(C 5Me 4CH 2) to give the titanium(III) silsesquioxane Cp* 2Ti[Cy 7Si 7O 10(OSiMe 3) 2] (21). In a similar manner treatment of Cp*Ti(C 5Me 4CH 2) with Cy 7Si 7O 9(OH) 2(OSiMe 3) (14) affords the mono(pentamethylcyclopentadienyl) complex Cp*Ti[Cy 7Si 7O 11(OSiMe 3)][Cy 7Si 7O 10-(OH)(OSiMe 3)] (22) which is an advanced model compound for a catalytically active titanium center on a silica surface. The molecular structures of these titanium silsesquioxane derivatives have been determined by X-ray diffraction analyses. 相似文献
7.
Treatment of p-tert-butylcalix[6]areneH 6 (H 6L) with [Mo(OBu t) 2{[2,2′-( N)-C 6H 4] 2(CH 2CH 2)}] in refluxing toluene affords, after work-up, the complex [Mo(2-NC 6H 4CH 2CH 2C 6H 4NHC(Me)NH-2 /)LH 2]·4MeCN (1), which contains an 11-membered metallocyclic ring as characterised by Synchrotron X-radiation. 相似文献
8.
The synthesis and reactivity of {(η 5-C 5H 4SiMe 3) 2Ti(CCSiMe 3) 2} MCl 2 (M = Fe: 3a; M = Co: 3b; M = Ni: 3c) is described. The complexes 3 are accessible by the reaction of (η 5-C 5H 4SiMe 3) 2Ti(CSiMe 3) 2 (1) with equimolar amounts of MCl 2 (2) (M = Fe, Co, Ni). 3a reacts with the organic chelat ligands 2,2′-dipyridyl (dipy) (4a) or 1,10-phenanthroline (phen) (4b) in THF at 25°C to afford in quantitative yields (η 5-C 5H 4SiMe 3) 2Ti(CSiMe 3) 2 (1) and [Fe(dipy) 2]Cl 2 (5a) or [Fe(phen) 2]Cl 2 (5b). 1/ n[Cu IHal] n (6) or 1/ n[Ag IHal] n (7) (Hal = Cl, Br) react with {(η 5 -C 5H 4SiMe 3) 2Ti(CCSiMe 3) 2}FeCl 2 (3a), by replacement of the FeCl 2 building block in 3a, to yield the compounds {(η 5-C 5H 4SiMe 3) 2Ti(C CSiMe 3) 2}Cu IHal (8) or {(η 5-C 5H 4SiMe 3) 2Ti(CSiMe 3) 2}Ag IHal (9) (Hal = Cl, Br), respectively. In 8 and 9 each of the two Me 3SiCC-units is η 2-coordinated to monomeric Cu I Hal or Ag IHal moieties. Compounds 8 and 9 can also be synthesized by the reaction of (η 5-C 5H 4SiMe 3) 2 Ti(CSiMe 3) 2 (1) with 1/ n[Cu IHal] n (6) or 1/ n [Ag IHal] n (7) in excellent yields. All new compounds have been characterized by analytical and spectroscopic data (IR, 1H-NMR, MS). The magnetic moments of compounds 3 were measured. 相似文献
9.
Reaction of Me 3SiMe 2SiC 5H 5 (4), prepared from Me 3SiMe 2SiCl and C 5H 5Na, with Fe(CO) 5 in refluxing xylene afforded the title compound (3). The silicon-silicon bond in 3 is exceptionally stable in refluxing xylene and also in succeeding reactions to prepare a series of its derivatives. Thus, 3 reacted with I 2 in either chloroform or benzene, giving [η 5-Me 3SiMe 2SiC 5H 4Fe(CO) 2I] (6). Compound 3 was reduced by sodium amalgam and reacted subsequently with CH 3I, PhCH 2Cl, CH 3COCl, PhCOCl, Cy 3SnCl (Cy = cyclohexyl) and Ph 3SnCl, producing [η 5-Me 3SiMe 2SiC 5H 4Fe(CO) 2R][7 : R = CH 3 (a), PhCH 2 (b), CH 3CO (c), PhCO (d), Cy 3Sn (e) and Ph 3Sn (f), respectively]. The molecular structure of 3 has been determined by X-ray diffraction crystallography. It was found that 3 has a trans-configuration with a symmetrical centre located at the middle of the Fe---Fe bond. It is abnormal that the conformation of the disilane part around the Si---Si bond is almost eclipsed rather than staggered. 相似文献
10.
In order to understand the nature of the putative cationic 12-electron species [M(η 5:η 1-C 5R 4SiMe 2NR′)R″] + of titanium catalysts supported by a linked amido-cyclopentadienyl ligand, several derivatives with different cyclopentadienyl C 5R 4 and amido substituents R′ were studied systematically. The use of tridentate variants (C 5R 4SiMe 2NCH 2CH 2X) 2− (C 5R 4=C 5Me 4, C 5H 4, C 5H 3tBu; X=OMe, SMe, NMe 2) allowed the NMR spectroscopic observation of the titanium benzyl cations [Ti(η 5:η 1-C 5Me 4SiMe 2NCH 2CH 2X)(CH 2Ph)] +. Isoelectronic neutral rare earth metal complexes [Ln(η 5:η 1-C 5R 4SiMe 2NR′)R″] can be expected to be active for polymerization. To arrive at neutral 12-electron hydride and alkyl species of the rare earth metals, we employed a lanthanide tris(alkyl) complex [Ln(CH 2SiMe 3) 3(THF) 2] (Ln=Y, Lu, Yb, Er, Tb), which allows the facile synthesis of the linked amido-cyclopentadienyl complex [Ln(η 5:η 1-C 5Me 4SiMe 2NCMe 3)(CH 2SiMe 3)(THF)]. Hydrogenolysis of the linked amido-cyclopentadienyl alkyl complex leads to the dimeric hydrido complex [Ln(η 5:η 1-C 5Me 4SiMe 2NCMe 3)(THF)(μ-H)] 2. These complexes are single-site, single-component catalysts for the polymerization of ethylene and a variety of polar monomers such as acrylates and acrylonitrile. Nonpolar monomers such as -olefins and styrene, in contrast, give isolable mono-insertion products which allow detailed studies of the initiation process. 相似文献
11.
Organolanthanide chloride complexes [(CH 3OCH 2CH 2C 5H 4) 2Ln(μ-Cl)] 2 (Ln = La, Pr, Ho and Y) react with excess NaH in THF at 45°C to give the dimeric hydride complexes [(CH 3OCH 2CH 2C 5H 4) 2Ln(μ-H)] 2, which have been characterized by IR, 1H NMR, MS and XPS spectroscopy, elemental analyses and X-ray crystallography. [(CH 3OCH 2CH 2C 5H 4) 2Y(μ-H)] 2 crystallizes from THF/n-hexane at −30°C, in the triclinic space group P1 with a = 8.795(2) Å, b = 11.040(1) Å, c = 16.602(2) Å, = 93.73(1)°, β = 91.82(1)°, γ = 94.21(1)°, Dc = 1.393 gcm −3 for Z = 2 dimers. However, crystals of [(CH 3OCH 2CH 2C 5H 4) 2Ho(μ-OH)] 2 were obtained by recrystallization of holmium hydride in THF/n-hexane at −30°C, in the orthorhombic space group Pbca with a = 11.217(2) Å, b = 15.865(7) Å, c = 17.608(4) Å, Dc = 1.816 gcm −3 for Z = 4 dimers. In the complexes of yttrium and holmium, each Ln atom of the dimers is coordinated by two substituted cyclopentadienyl ligands, one oxygen atom and two hydrogen atoms (for the Y atom) or two hydroxyl groups (for the Ho atom) to form a distorted trigonal bipyramid if the C(η 5)-bonded cyclopentadienyl is regarded as occupying a single polyhedral vertex. 相似文献
12.
Polymerizations of ethylene have been carried out by using Cp 2*Zr(NMe 2) 2 (Cp *=C 5Me 5) compound combined with common alkyl aluminums (AlR 3) and methylaluminoxane (MAO) as cocatalysts. The AlMe 3 cocatalyzed system showed no activity due to the formation of stable but inactive heterodinuclear [Cp 2*2Zr(μ-Me) 2AlMe 2] + cations; however, the bulkier AlR 3 [AlEt 3, Al( i-Bu) 3 and Al( i-Bu) 2H] cocatalyzed systems showed very high activities. Especially, Cp 2*Zr(NMe 2) 2/Al( i-Bu) 3 catalyst showed higher catalytic activity and produced higher molecular weight (MW) polymer than Cp 2*Zr(NMe 2) 2/MAO catalyst, demonstrating both MAO and bulky AlR 3 are effective cocatalysts for Cp 2*Zr(NMe 2) 2 compound. 相似文献
13.
The preparation, spectroscopic characterization and magnetic study of N, N′-bis(substituted-phenyl)oxamidate-bridged nickel(II) dinuclear complexes of formula {[Ni(N 3-mc)] 2(μ-CONC 6H 4-X)}(PF 6) 2 (N 3-mc = 2,4,4-trimethyl-1,5,9-triazacyclo-dodec-1-ene (Me 3-N 3-mc) or 2,4,4,9-tetramethyl-1,5,9-triazacyclododec-1-ene (Me 4-N 3-mc), X = 2-Cl, 4-Cl, 2-OCH 3, 4-OCH 3) are reported. These paramagnetic nickel(II) complexes have been characterized by both one- and two-dimensional (COSY) 1H NMR techniques. The COSY spectrum of 5 has allowed to achieve the assignment of the phenyl protons of the N, N′-diphenyloxamidate. The crystal structures of [Ni(Me 3-N 3-mc)(μ-CONC 6H 4-4-Cl)] 2(PF 6) 2 (6), [Ni(Me 3-N 3-mc)(μ-CONC 6H 4-4-OMe)] 2(PF 6) 2 (8) and [Ni(Me 4-N 3-mc)(μ-CONC 6H 4-2-Cl)] 2(PF 6) 2 (9) have been determined and their magnetic properties have been studied. The value of magnetic coupling between the two nickel(II) ions across the oxamidate bridge [ J = − 37.6 (6), −39.9 (8) and −39.7 cm −1 (9)] is sensitive to the distortion of the coordination sphere of the metal ions and the topology of the molecular bridge. 相似文献
14.
The cluster [Os 3(CO) 10(MeCN) 2] reacts with indazole (C 7H 6N 2) to give two isomeric products [0s 3( μ-H)( μ-C 7H 5N 2)(CO) 10] in which the five-membered ring has been metallated with N-H cleavage to give an N, N-bonded isomer or with C-H cleavage to give a C, N-bonded isomer. These two isomers have very similar X-ray structures but can be clearly distinguished by 1H NMR methods. They are shown to correspond to related clusters derived from pyrazole. Benzotriazole (C 6H 5N 3) also reacts (as shown earlier by others) to give two isomers: an N, N-bonded species [Os 3( μ-H)( μ-C 6H 4N 3)(CO) 10] coordinated only through the five-membered ring and a minor C, N-bonded isomer [Os 3( μ-H)( μ-C 6H 4N 3)(CO) 10], metallated at the C 6 ring and coordinated through both rings. The former isomer reacts with Me 3NO in acetonitrile to give [Os 3( μ-H)( μ-C 6H 4N 3)(CO) 9(MeCN)] which thermally looses MeCN to produce the coupled product [Os 6( μ-H) 2( μ3-C 6H 4N 3) 2(CO) 18] which was shown by X-ray structure determination to have all six nitrogen atoms coordinated to osmium, a novel situation for coordinated benzotriazole. The two Os 3 units are linked together by an OsNNOsNN ring in a boat conformation with the whole cluster adopting C2 symmetry. 相似文献
15.
二环戊二烯基二氯化钛与脂肪醇的反应是非常复杂的,由于反应体系不同,所得的产物也不同,且产物又不稳定 [1-3]。 相似文献
16.
Liquid crystalline 4-XC 6H 4N=NC 6H 4X-4′ [X = C 4H 9 (1a), C 1OH 21 (1b), OC 4H 9 (1c), OC 8H 17(1d)] can be easily prepared in high yields from the corresponding anilines. In order to study the influence of metals on the thermal properties of these materials, we have obtained adducts [AuCl 3(4-C 4H 9OC 6H 4N=NC 6H 4OC 4H 9-4′)] (2) and [Ag(OC1O 3)L 2] [L = 4-XC 6H 4N=NC 6H 4X-4′; X = OC 4H, (3a), OC 8H 17 (3b)]. The silver adducts show themotropic behaviour. Mercuriation of dialkylazobenzenes 1a-b takes place with [Hg(OAc) 2] and LiCl to give [Hg(R)Cl] [R = C 6H 3(N=NC 6H 4X-4′)-2, X-5; X = C 4H 9 (bpap) (4a), C 10H 21 (dpap) (4b)] while dialkoxyazobenzenes 1c–d require [Hg (OOCCF 3) 2] to obtain [Hg(R)Cl] [R = C 6H 3(N---NC 6H 4X-4′)-2, X-5; X = OC 4H 9 (bxpap) (4c), OC 8H 17 (4d)]. 4a-c react with NaI to give [HgR 2] [R= bpap (5a), dpap (5b), bxpap (5c), oxpap (5d)l. Both chloroaryl-, 4a and 4c, and diaryl-mercurials, 5a and 5c, act readily as transmetailating agents towards [Me 4N] [AuCl 4] in the presence of [Me 4N]Cl to give [Au(η 2-R)Cl 2] [R = bpap (6a), bxpap (6b)]. After reaction of [AuCl 3(tht)] (tht = tetrahydrothiophene) with [Me 4N]Cl and 4b (1:2:1), [Me 4N][Au(dpap)Cl 3] (7) can be isolated. C---H activati bxpap (8b)]. None of the complexes 4–8 shows mesomorphic behaviour. 相似文献
17.
1,2-二(1-苯基环己基环戊二烯基)四甲基二硅烷与Fe(CO) 5在二甲苯中加热回流生成二铁化合物(Me 2SiSiMe 2)[(1-Ph-c-C 6H 10C 5H 3)Fe(CO)] 2(μ-CO) 2(2).通过柱层析分离到化合物2的顺反异构体2c和2t,并分别进行热重排反应,发现顺式底物2c重排生成反式重排产物[Me 2Si(c-C 6H 10PhC 5H 3)Fe(CO) 2] 2(3t),而反式底物2t重排则生成顺式重排产物3c.这表明重排反应是立体专一性的.通过X射线衍射分析测定了化合物2c和3t的晶体结构. 相似文献
18.
The complex (di-η 5-C 5H 4CH 2CH 2CH 2C 5H 4)Ti(η 1-C 5H 5) 2 (I) can be obtained unambiguously starting from the corresponding bridged titanocene dichloride. Attempts to synthesize the isomeric compounds (η 5-C 5H 5) 2 Ti(di-η 1-C 5H 4-CH 2CH 2CH 2C 5H 4) (I′) by the action of a convenient bridged dianion on (C 5H 5) 2 TiCl 2 afford several compounds, one of them is the complex I. The possibility of interconversion of these complexes by a fluctional process is discussed. 相似文献
19.
A palladium dimer with a cobalt-containing phosphine ligand, {(μ-PPh 2CH 2PPh 2)Co 2(CO) 4(μ,η-( tBu) 2PCCC 6H 4-κC 1)Pd(μ-Cl)} 2 (3), was prepared from the reaction of its monomer precursor, (μ-PPh 2CH 2PPh 2)Co 2(CO) 4(μ,η-( tBu) 2PCCC 6H 4-κC 1)Pd(μ-OAc) (2), with LiCl. The crystal structure of 3, determined by X-ray diffraction methods, revealed a doubly chloride-bridged palladium dimeric conformation. Suzuki coupling reactions of bromobenzene with phenylboronic acid were carried out catalytically using these two novel palladium complexes 2 and 3 as catalyst precursors. Factors such as the molar ratio of substrate/catalyst, reaction temperature, base and solvent that might affect the catalytic efficiencies were investigated. As a general rule, the performance is much better by employing 3 than 2 as the catalyst precursor. 相似文献
20.
The crystal structure of Cp 2TiC 6H 5CN-2,6-(CH 3) 2C 6H 3 is reported. The iminoacyl ligand is η 2-coordinated at the metal (Ti---C 2.096(4), Ti---N 2.149(4) Å). The cyclopentadienyl ligands show the normal bent Cp 2Ti structure. 相似文献
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