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1.
Mukesh Kumar Keith H. Pannell 《Journal of Inorganic and Organometallic Polymers and Materials》2008,18(1):131-142
Bifunctional organometallic silicon precursor monomers and substrates FC(SiMe2H)2 (1) [FC = (η5-C5H4)Fe(η5-C5H4)]; FC(SiMe2(CH2)xCH=CH2)2 [x = 0 (2), 1 (3)], [η5-C5H4-SiMe2(CH2)xCH=CH2)]Fe(CO)2SiMe2(CH2)xCH=CH2 x = 0 (4), 1 (5) and (η5-C5H4-SiMe2H)Fe(CO)2SiMe2H (6) have been used to make a series of new iron containing polymers via hydrosilylation reactions. In addition to the vinyl-
and allyl-containing substrates 2, 3, 4 and 5 the organosilicon compounds [CH2=CHSiMe2]2O, 1,4-(H2C=CH-SiMe2)2C6H4 and (HC≡CH–SiMe2)2O were also used as substrates for the hydrosilylation reaction. The reactions between the various SiH and CH=CH2 and C≡C functionalities were performed in the presence of Pt(0) catalyst and resulted in regioselective (β-isomer and β-(E)
isomer) products as determined by NMR spectroscopy. Molecular weights of all the polymers were determined by Gel Permeation
Chromatography, which revealed oligomeric materials with narrow polydispersity. Cyclic voltammetric studies of exhibited single
reversible redox processes due to the Fe(II)/Fe(III) couple when present, and irreversible oxidation for the presence of any
Fp Fe atom.
This article is dedicated to Professor Astruc. 相似文献
2.
Alexander Trujillo Sourisak Sinbandhit Loïc Toupet David Carrillo Carolina Manzur Jean-René Hamon 《Journal of Inorganic and Organometallic Polymers and Materials》2008,18(1):81-99
The synthesis of neutral dinuclear iron–nickel unsymmetrical Schiff base complexes 3 and 4 was achieved via a template reaction involving equimolar amounts of alkyl or aryl “half-unit” precursors, respectively, Fc–C(O)CH=C(CH3)N(H)R (1: R = CH2CH2NH2; 2: R = o-C6H4NH2; Fc = CpFe(η5-C5H4); Cp = η5-C5H5), 5-bromosalicylaldehyde and nickel(II) acetate tetrahydrate in a refluxing CH2Cl2/MeOH (1:1) mixture. The ionic trinuclear unsymmetrical complex 5 was prepared by reacting its dinuclear precursor 3 with the arenophile source, [Cp*Ru(NCCH3)3]PF6 (Cp* = η5-C5(CH3)5), in refluxing CH2Cl2 for 2 h, whereas the trinuclear species 6 was formed upon regioselective π-complexation of the 5-bromosalicylidene ring of 4 by [Cp*Ru]+ at room temperature overnight. All the new compounds were adequately characterized by analytical and spectroscopic techniques
and, in addition, the crystal and molecular structures of the “half-unit” 1, the binuclear complex 4 and its hemisolvate adduct 4 · 0.5CH3OH, the trinuclear Schiff base compound 5 · 2(CH3)2CO, and the mixed sandwich metalloligand 7 have been determined by X-ray crystallography. Both organometallic–inorganic hybrids 5 and 6 contain the neutral electron-releasing ferrocenyl group, and the cationic electron-withdrawing ruthenium mixed sandwich,
linked through the unsymmetrical tetradentate Schiff base complex {Ni(ONNO)}. UV–vis, 1H and 13C NMR as well as electrochemical data clearly indicate a mutual donor–acceptor electronic influence between the organometallic
termini. Furthermore, X-ray crystal structure analysis of 5 · 2(CH3)2CO reveals the partial delocalization of bonding electron density throughout the dinucleating nickel Schiff base ligand.
Dedicated to Prof. Didier Astruc, a true friend, an outstanding lecturer and scientist, in honor of his pioneering research
efforts and accomplishments in the fields of organometallic chemistry, dendrimers and their applications in nanocatalysis. 相似文献
3.
Mukesh Kumar Keith H. Pannell 《Journal of Inorganic and Organometallic Polymers and Materials》2007,17(1):105-110
Synthesis of new ferrocenylenesilylene polymers was effected by direct hydrosilylation/polymerization of 1,1′-methylsilyl-ferrocenophane
[FC–SiMeH] (FC = (η5-C5H4)Fe(η5-C5H4) with acetylenes and organometallic olefins using a Pt0 catalyst. The reaction of [FC–SiMeH] with HC2Ph, HC2SiMe3, CH2=CHSiMe2Fp, Fp = (η5-C5H5)Fe(CO)2 and CH2=CHCH2SiMe2Fp in the presence of a platinum catalyst resulted in high yields of the corresponding hydrosilylated polymers. In the case
of the acetylenes only β products were obtained, both E and Z isomers, whereas for the olefins both α and β-isomers were noted.
Only in the case of the more bulky allylsilicon material was any unreacted SiH functionality retained in the polymer, an effect
also noted when using [FCSiPhH] as the starting ferrocenophane. Cyclic voltammetric studies on these polymers revealed metal–metal
interaction with two redox processes associated with the ferrocenylene Fe center along with an irreversible oxidation at higher
potential for the Fp Fe atom.
Ian: A pleasure to contribute; keep up the good work-aptp, cheers, Keith. 相似文献
4.
Bertuleit Axel Könemann Martin Duda Lothar Erker Gerhard Fröhlich Roland 《Topics in Catalysis》1999,7(1-4):37-44
6-dimethylamino-6-methylfulvene (7) was converted to the [(C5H4)–CMe2–NMe2]− ligand system (8) by treatment with methyllithium. Its reaction with MCl4 (M = Zr, Ti) followed by treatment with CH3Li gave the respective [(C5H4)–CMe2–NMe2]2M(CH3)2 complexes (12). Their reaction with B(C6F5)3 led to reactive metallocene cation complexes that instantaneously underwent CH activation at a N–CH3 group to yield the metallacyclic cation complexes 15. (tert-butylaminomethyl)fluorene was prepared by the addition of tert-butylisocyanate
to fluorenyllithium followed by hydride reduction. Deprotonation by a variety of bases gave rise to a series of competing
and consecutive reactions to yield several unusually structured products, among them a fluorenyl-anellated η5-1-azapentadienyl anion equivalent (25) and [(flu)-CH2–NCMe3]Li2 (23). An improved way of generating synthetically useful C1-linked [Cp–C1(R)
n
–NR1]2- dianion equivalents was developed starting from 6-amino-6-methylfulvene (26). N-silylation followed by double deprotonation
with, e.g., lithium diisopropylamide cleanly furnished the respective [(C5H4)–C(=CH2)–NSiMe3]2- dianion 33 (isolated as the dilithio derivative). Its reaction with Cl2Zr(NEt2)2 in THF gave [η5:κ-N-(C5H4)–C(=CH2)–NSiMe3]Zr(NEt2)2 36. Activation of 36 with methylalumoxane in toluene led to the formation of a C1-linked “constrained geometry” Ziegler catalyst that polymerized ethylene similarly as the [(C5Me4)SiMe2NCMe3]ZrCl2 derived literature system.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
5.
《Inorganic chemistry communications》2002,5(12):1034-1040
A series of N-para-(ferrocenyl)benzoyl amino-acid esters, para-Fc(C6H4)CONHCH(R)CO2CH3 {Fc = (η5-C5H5)Fe(η5-C5H4); R = H, CH3, CH2CH(CH3)2, CH2C6H5}, 3–6 have been prepared by coupling para-(ferrocenyl)benzoic acid to the amino-acid esters (gly, l-Ala, l-Leu, l-Phe) using the standard 1,3-dicyclohexylcarbodiimide (DCC), 1-hydroxybenzotriazole (HOBt) protocol. The compounds were fully characterized by a range of spectroscopic techniques including FAB-MS. The X-ray crystal structures of the parent para-(ferrocenyl)benzoyl methyl ester, Fc-C6H4CO2Me, 1 and a chiral derivative N-{para-(ferrocenyl)benzoyl}-l-alanine methyl ester, Fc-C6H4CONHCH(CH3)CO2Me, 4 have been determined. 相似文献
6.
In two previous papers (Kinget al., J. Organomet. Chem.
19, 327, 1969; Pannellet al., Organometallics
9, 859, 1990), the synthesis and X-ray structure of the two tetramethyl disilyl complexes [(5-C5H5) Fe(CO)2]2Si2Me4 (I) and Si2Me4[(5-C5H4) Fe(CO)2CH3]2 (II) were reported. ComplexII is obtained fromI [2]. However, attempts to form other derivatives fromI have generally failed. In the chemical process to getII fromI, an intermediate complex, Si2Me4[(5-C5H4) Fe(CO)2]
2
2–
(III), is probably formed. This is similar to complexII without the two methyl groups bonded to the Fe atoms. Therefore, a theoretical study that may shed some light on the intermediate structure, stability, and reactivity is justified. We have developed theoretical studies consisting of extended Huckel electronic structure calculations on the simulated intermediate geometry. The results obtained from these calculations suggest that it might be stable enough to form during reactions of complexI. The more reactive sites, which suggest reaction alternatives, are pointed out.Presented at the XXVIth Silicon Symposium, Indiana University-Purdue University at Indianapolis, March 26–27, 1993.On sabbatical leave from Departamento de Química. Universidad Autónoma Metropolitana-Iztapalapa, 09340 D.F., México. 相似文献
7.
Summary Propargyl esters (HC≡CCH2OC(=O)R; 1: R = n-C5H11, 2: R = CH3, 3: R = CHBrCH3, 4: R = C6H5, 5: R = C(C6H5)3) were polymerized by using (nbd)Rh+(η6-Ph-B-Ph3) (nbd = 2,5-norbornadiene) to produce poly(1)–poly(5) with molecular weights in the range of Mn = 4,900–40,000. Poly(1), poly(3) and poly(4) were readily soluble in common organic solvents such as toluene, THF and CHCl3, and poly(2) showed similar solubility behavior except that it was insoluble in THF. Poly(5) did not dissolve in any organic solvent. Poly(1) was yellow oil, while poly(2)–poly(5) were yellow solids. Poly(1)–poly(4) exhibited UV-vis absorptions in a range of 300–425 nm, which are attributed to the conjugation of the main chain. All the
polymers were thermally stable up to 150–200 °C. 相似文献
8.
《Inorganic chemistry communications》2007,10(7):748-752
The cytotoxic activity on tumour cell lines, human adenocarcinoma HeLa, human myelogenous leukemia K562, human malignant melanoma Fem-x and normal immunocompetent cells, was tested for four different ansa-titanocene dichloride derivatives with potentially reactive substituents [Ti{Me(CH2CH)Si(η5-5Me4) (η5-C5H4)}Cl2] (1), [Ti{Me(H)Si(η5-C5Me4)2}Cl2] (2), [Ti{Me{(CH2CH)Me2SiCH2CH2}Si(η5-C5Me4)(η5-C5H4)}Cl2] (3) and [Ti{Me2Si(η5-C5Me4)(η5-C5H3(CMe2(CH2CH2CHCH2)))}Cl2] (4), showing a very promising activity and opening up the possibility of extensive investigation in this field. 相似文献
9.
《Inorganic chemistry communications》2003,6(10):1344-1346
The reaction of the sodium salt of the monoanion, nido-[2,3-(Si(CH3)3)2-2,3-C2B4H5]−, with (chloromethyl)dimethylchlorosilane in a 1:1 molar ratio produced the B(cage)-substituted cluster, nido-5-ClCH2Si(CH3)2-2,3-(Si(CH3)3)2-2,3-C2B4H5 (1), in 81% yield. This product (1) was reacted further with the lithium salt of [closo-1-R-1,2-C2B10H10]− monoanion (R=Me, Ph) to give the novel linked and mixed C2B4/C2B10 carborane species, 1-Me-2-[5′-SiMe2CH2-2′,3′-(SiMe3)2-2′,3′-C2B4H5]-1,2-C2B10H10 (2), 1-Ph-2-[5′-SiMe2CH2-2′,3′-(SiMe3)2-2′,3′-C2B4H5]-1,2-C2B10H10 (3), in yields of 76% and 81%, respectively. 相似文献
10.
Feng Guo Xiuling Zhang Baoyong Zhu Jianchao Qiu 《Journal of Inorganic and Organometallic Polymers and Materials》2010,20(1):38-45
Four novel compounds [Co(Hdpa) 2(4,4′-bipy)2]n (1), {[Ni(dpa)(2,2′-bipy)(H2O)](H2O)}n, (2), [Ni(dpa)(im)3]n (3) and [Zn(dpa)(im)]n (4) [H2dpa = 2,4′-diphenyl-dicarboxylic acid, 4,4′-bipy = 4,4′-bipyridine, 2,2′-bipy = 2,2′-bipyridine and im = imidazole] were synthesized
and characterized by elemental analysis, IR and single-crystal X-ray diffraction. X-ray crystallography shows that the 2,4′-diphenic
acid exhibits three coordination modes to link the metal ions: μ
1
−η1: η1/μ
0
−η0: η0, μ
1−η
1: η
0/μ
2−η
1: η
1 and μ
1−η
1: η
0/μ
1−η
1: η
0. Compound 1 has a 1D supramolecular structure. Compounds 2 and 3 are 3D supramolecular structures. Compound 4 is a 2D supramolecular structure. All the compounds, 1–4, are self-assembled to form supramolecular structures through hydrogen bonding interactions. 相似文献
11.
Sarah E. Brady Ginger V. Shultz David R. Tyler 《Journal of Inorganic and Organometallic Polymers and Materials》2010,20(3):511-518
The [(η5-C5H4(CH2)3OC(O)(CH2)2C≡CH)Mo(CO)3]2 complex (1) was synthesized and used to explore the feasibility of using the Huisgen cycloaddition reaction (a click reaction) to incorporate
molecules with metal–metal bonds into polymer backbones. In a model reaction, coupling of 1 with benzyl azide was observed in 24 h using Cp*Ru(PPh3)2Cl as a catalyst. In contrast, the reaction of 1 with benzyl azide using a CuBr/ligand catalyst (where the ligand is either PMDETA or bipyridine), resulted in disproportionation
of the Mo–Mo unit in 1. Complex 1 was also coupled with telechelic azide-terminated polystyrene oligomers. With either the CuBr/PMDETA or CuBr/bipyridine catalyst,
disproportionation of the Mo–Mo bonded unit occurred before complete coupling was observed. The reaction was also slow when
the Cp*Ru(PPh3)2Cl catalyst was used; however, no disproportionation products were observed and a high molecular weight polymer (M
n = 120,000 g/mol) was produced. The Cp*Ru(PPh3)2Cl catalyst was also used to couple 1 with azide-terminated poly(ethylene glycol). After 15 h, this reaction produced a polymer with M
n = 73,000 g mol−1. It is concluded that, although somewhat slow, click chemistry using the Cp*Ru(PPh3)2Cl catalyst is an excellent method for synthesizing high molecular weight polymers with metal–metal bonds along the backbone. 相似文献
12.
Carlos Díaz María Luisa Valenzuela Nicolás Yutronic 《Journal of Inorganic and Organometallic Polymers and Materials》2007,17(4):577-582
A simple synthetic route to monometallic and bimetallic nanostructured materials is presented. Pyrolysis of the organometallic
iron co-polyphosphazenes, [{[N = P(R1)2]0.8[N = P(OC6H4CH2CN[Fe])2]0.15}{PF6}0.32]n
(1) and [{[N = P(R1)2]055[N = P(OC6H4CH2CN[Fe])2]0.2}{PF6}0.32]n
(2) with R1 = OC12H8 [Fe] = CpFe(dppe)+ Cp = η−C5H5, dppe = PPh2(CH2)2PPh2 in air affords nanoparticles of the iron pyrophosphate Fe2Fe5(P2O7)4, while the pyrolysis of both copolymers in air and in the presence of TlPF6 yield bimetallic Tl, Fe nanostructures. The polyphosphazene acts as a hybrid organic–inorganic template. By carbonization,
the organic part of the polymer provides holes where the metallic centers grow while the inorganic P = N acts as precursor
for the formation of phosphorus oxides, which form the metal pyrophosphates or the stabilizing matrix. Pyrolysis of organometallic
polyphosphazene polymers containing two organometallic fragments is discussed as a new and general method for obtaining bimetallic
nanostructured materials. 相似文献
13.
Polyferrocenylsilanes [Fe(η-C5H4)2SiMePh]
n
(3) and [Fe(η-C5H4)2SiMe2]
n
(4) were prepared by transition metal-catalyzed ring-opening polymerization (ROP) and thin films of these materials were studied to investigate their potential utility as protective charge migration coatings for dielectrics. Films (
15 μm) of 3 or 4 cast from a concentrated toluene solution coated on Mylar did not experience any arc discharging when exposed to a beam of low energy (20 keV) electrons for a 1 h time period. In order to further investigate the charge migration properties of polyferrocenylsilanes, thick shapes and films of 3 were prepared by mold-extrusion and solution-casting onto a Teflon substrate, respectively. Charge accumulation measurements on 3 using a nonintrusive electrostatic probe showed that even after a 1 h exposure to a 25 keV electron flux, no appreciable charge accumulation existed. The direction of current flow was explored by constructing a device consisting of a film (thickness ca. 100–130 μm) of polymer 3 coating a layer of copper. When positioned beneath a circular mask and exposed to a low energy electron flux (5–25 keV), measurements of the current at the surface of the polymer film either exposed to or not exposed to the electron flux were not significantly different, and the current recorded from the bare copper connection to the ground was significantly (100–1000 times) higher. Although the mechanism of charge migration in polyferrocenylsilanes is not fully understood, these experiments indicated it may arise from a conduction mechanism, however electron scattering may also be involved.Dedicated to Professor Richard J. Puddephatt in recognition of his
outstanding and scholarly contributions to chemistry. 相似文献
14.
《Inorganic chemistry communications》1999,2(9):396-398
Compounds (η5-C5H4CH2CH2OCH3)TiCl3, (η5-C5H4CH2CH2OCH3)2TiCl2 and (η5-C5H4CH2CH2OCH3)(η5-C5H5)TiCl2 react with BBr3 to give a high yield of titanium compounds containing cyclopentadienyl ligands with bromoethyl substituents, (η5-C5H4CH2CH2Br)TiBr3 (1), (η5-C5H4CH2CH2Br)2TiBr2 (3) and (η5-C5H4CH2CH2Br)(η5-C5H5)TiBr2 (4), respectively. Hydrolysis of 1 in the presence of tert-butylamine affords cyclo-[(η5-C5H4CH2CH2Br)TiBr(μ-O)]4 (2) in quantitative yield. The molecular structure of 2 was determined by X-ray diffraction. 相似文献
15.
A glutamic acid- and azobenzene-containing novel N-propargylamide, (S)-CHCCH2NHCOCH(CH2CH2CO2CH2C6H5)NHCO2CH2CH2-p-C6H4NNC6H5 (1) was synthesized and polymerized with (nbd)Rh+[η6-C6H5B−(C6H5)3] as a catalyst to obtain the corresponding polymer [poly(1)] with the moderate number-average molecular weight of 12,200 in 93% yield. The chiroptical studies revealed that poly(1) took a helical structure in THF, CHCl3, CH2Cl2 and toluene. Poly(1) underwent solvent and heat-driven helix-helix transition. The trans-azobenzene of the side chain isomerized into cis upon UV-irradiation, accompanying decrease in helicity. The cis-azobenzene moiety reisomerized into trans upon visible-light irradiation, while the polymer did not recover the original helicity. 相似文献
16.
Wai-Yeung Wong Suk-Yue Poon 《Journal of Inorganic and Organometallic Polymers and Materials》2008,18(1):155-162
A novel approach based on conjugation interruption was developed for a luminescent and thermally stable platinum(II) polyyne
polymer trans-[–Pt(PBu3)2C≡C(C6H4)CH2(C6H4)C≡C–]
n
(1) containing the diphenylmethane chromophoric spacer. Particular attention was focused on the photophysical properties of
this group 10 polymetallayne and comparison was made to its binuclear model complex trans-[Pt(Ph)(PEt3)2C≡C(C6H4)CH2(C6H4)C≡CPt(Ph)(PEt3)2] (2) and their closest group 11 gold(I) and group 12 mercury(II) neighbors, [MC≡C(C6H4)CH2(C6H4)C≡CM] (M = Au(PPh3) (3), HgMe (4)). The regiochemical structures of these angular-shaped compounds were studied by various spectroscopic analyses. Upon photoexcitation,
each of them emits an intense purple-blue fluorescence emission in the near UV region in dilute fluid solutions at room temperature.
Harvesting of organic triplet emissions harnessed through the strong heavy-atom effects of group 10–12 transition metals was
examined. These metal-containing phenyleneethynylenes spaced by the conjugation-breaking CH2 unit were found to have high optical gaps and high-energy triplet states. The influence of metal and sp3-hybridized methylene conjugation-interrupters on the intersystem crossing rate and the spatial extent of the lowest singlet
and triplet excitons was fully elucidated. Our investigations indicate that high-energy triplet states in these materials
intrinsically give rise to very efficient phosphorescence with fast radiative decays.
Dedicated to Professor Didier Astruc in recognition of his outstanding contribution to metallodendrimers and polymers. 相似文献
17.
Charles N. Myer Christopher W. Allen 《Journal of Inorganic and Organometallic Polymers and Materials》2007,17(1):143-148
The mixed substituent chlorocyclophosphazene monomers 2,2′-N3P3Cl4[O(CH2)4OC(O)C(Me)CH2][C5H5FeC5H4CH2NMe](1) and 2,2′,4-N3P3Cl3[O(CH2)4OC(O)C(Me)CH2][C5H5FeC5 H4CH 2NMe]2 (2) undergo radical addition copolymerization with methylmethacrylate to produce a broad range of copolymers having pendant
cyclophosphazenes containing a ferrocenyl substitutent. In both bulk and solution copolymerization, the conversion decreased
with increasing amount of 1 in the monomer feed with no copolymer formation observed in co-monomer mixtures containing greater than 50% of 1. NMR studies of the copolymers show that the copolymer composition is the same as the monomer feed and that the triad tacticity
is constant throughout the series for 1 but an increase in syndiotactic triads is observed for 2. TGA studies indicate an increase in char yield with an increase in the phosphazene content of the copolymer.
相似文献
Christopher W. AllenEmail: |
18.
Dipropynylbenzenes with alkyl groups (CH3C ≡ CRC6H2RC≡CCH3,
R=n-C6H13, n-C8H17,
n-C10H21, 1a–c, respectively) were polymerized with Mo(CO)6 to afford
solvent-soluble poly(2,5-dialkyl-p-phenyleneethynylene)s (2a–c). The polymers (2a–c) had high molecular weight over 3×104, and gave
free-standing membranes by solution casting method. According to thermogravimetric analysis (TGA), these
poly(p-phenyleneethynylene)s showed high thermal stability (T0
≥380 °C). The densities of membranes of poly(2,5-dialkyl-p-phenyleneethynylene)s (2a–c) were 0.936–0.965, and their
fractional free volume (FFV) were relatively large (ca. 0.14–0.15). The oxygen permeability coefficients
(PO2) of membranes of 2a–c were 4.88, 7.06, and 16.6 barrers, respectively. 相似文献
19.
In this article, four constrained geometry complexes 4a [(η5-C5H4)CH2(α-C4H3N)]Ti(NMe2)2, 7a [(η5-C9H6)CH2(α-C4H3N)]Ti(NMe2)2, 4b [(η5-C5H4)CH2(α-C4H3N)]Zr(NEt2)2, 7b [(η5-C9H6)CH2(α-C4H3N)]Zr(NEt2)2 with pyrrole-bridged fragment were synthesized and characterized by 1H NMR, 13C NMR, MASS, and EA. When combined with MAO, complex 4b given the highest activity, the activity of copolymerizing ethylene and 1-hexene reached 2.48 × 106 g polymer/mol·M·h. The effects of temperature, pressure, and ratio of Al/Metal on the polymerization reaction and properties of polymers had been investigated. The polymers with these complexes were characterized by 13C NMR and DSC, and the results shown that polymer with 4a had the highest α-olefin incorporation, the incorporation of 1-hexene reached up to 9.81 mol%, and the 1-octene was 8.84 mol%. Actually, there was no [HH] or [OO] sequence in the copolymer, according to the formula of reactivity ratio, rE • rH = 0, all these results suggested that the copolymerization mode is alternating copolymerization. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48620. 相似文献
20.
《Inorganic chemistry communications》2003,6(5):451-454
A one-pot method for the preparation of [Pd{[(η5-C5H3)–CHN–(CH2)2–NMe2]Fe(η5-C5H5)}Cl] is described. Its X-ray crystal structure and its reactions with the diphosphines Ph2P–(CH2)n–PPh2 {with n=1 (ddpm) or 2 (dppe)} are also reported. 相似文献