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2 edition of Synthesis of new electron-rich h¡ r-arylphosphine complexes of molybdenum (0) and their reactions with HBF r and HF. found in the catalog.

Synthesis of new electron-rich h¡ r-arylphosphine complexes of molybdenum (0) and their reactions with HBF r and HF.

Andrea Sella

Synthesis of new electron-rich h¡ r-arylphosphine complexes of molybdenum (0) and their reactions with HBF r and HF.

by Andrea Sella

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  • 32 Currently reading

Published .
Written in English


The Physical Object
Pagination90 leaves
Number of Pages90
ID Numbers
Open LibraryOL19077301M

The chemistry of transition metal carbyne complexes has become a highly attractive field during the past twenty years. In recent years its application to aspects of catalysis and metathesis has gained considerable interest from inorganic as well as organic chemists.   INTRODUCTION. In the last 10 years we have been exploring early transition metal complexes that contain a triamidoamine ligand, [(RNCH 2 CH 2) 3 N] 3− ([RN 3 N] 3−). 1 These trianionic ligands bind to an early transition metal in a relatively high oxidation state (~3 + or higher) in a tetradentate fashion, leaving three orbitals for binding substrates in the trigonally symmetric “pocket.

UNESCO – EOLSS SAMPLE CHAPTERS INORGANIC AND BIO-INORGANIC CHEMISTRY – Vol. II - Synthesis and Spectroscopy of Transition Metal Complexes - Antonio Bianchi and Alessandro Bencini ©Encyclopedia of Life Support Systems (EOLSS) ethylenediamine) affords the [Cr(en)][Ni(CN) ]H O produ52ct containing both square pyramidal and trigonal bipyramidal About 25 years after the first planned synthesis of a carbene complex in E.O. Fischer's laboratory in Munich the NATO Advanced Research Workshop on Transition-Metal Carbene Complexes was the first meeting which,brought together scientists from different disciplines to discuss inorganic, organic, theoretical structural catalysis-related aspects.

Transition metal carbyne complexes are organometallic compounds with a triple bond between carbon and the transition triple bond consists of a σ-bond and two π-bonds. The HOMO of the carbyne ligand interacts with the LUMO of the metal to create the σ-bond. The two π-bonds are formed when the two HOMO orbitals of the metal back-donate to the LUMO of the carbyne.   A potentially useful trianionic ligand for the reduction of dinitrogen catalytically by molybdenum complexes is one in which one of the arms in a [(RNCH 2 CH 2) 3 N] 3− ligand is replaced by a 2-mesitylpyrrolyl-α-methyl arm, i.e., [(RNCH 2 CH 2) 2 NCH 2 (2-MesitylPyrrolyl)] 3− (R = C 6 F 5, 3,5-Me 2 C 6 H 3, or 3,5-t-Bu 2 C 6 H 3).Compounds have been prepared that contain the ligand in.


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Synthesis of new electron-rich h¡ r-arylphosphine complexes of molybdenum (0) and their reactions with HBF r and HF by Andrea Sella Download PDF EPUB FB2

Synthesis of new molybdenum PNP pincer complexes. Next, we subjected (Ph 2 PCH 2 CH 2) 2 NH to the reaction with Mo(PPh 3) 2 (CH 3 CN) 2 (CO) 2 in THF. Interestingly, we obtained Mo(0)‐complex Mo‐3a, featuring a PPh 3 ligand coordinated to the metal Author: Thomas Leischner, Anke Spannenberg, Kathrin Junge, Matthias Beller.

Oxidative decarbonylation of cis-(η5-C5R5)M(CO)2(PMe3)Cl (1a−1d) (a, R = H, M = Mo; b, R = H, M = W; c, R = Me, M = Mo; d, R = Me, M = W) with 1 equiv of PhICl2 yields selectively the M(IV) complexes (η5-C5R5)M(CO)(PMe3)Cl3 (2a−2d). Complex 1c reacts with equiv of PhICl2 and complex 2d with equiv of PhICl2 to give respectively Cp*Mo(PMe3)Cl4 (3c) and Cp*W(PMe3)Cl4 (3d) (Cp Cited by: The reactions of the ligands Ph 2 PCH 2 C(O)R (R = Ph, NPh 2) with the η 6-arene molybdenum complexes [Mo(η 3-C 3 H 5)(μ-Cl)(η 6-C 6 H 5 R)] 2 (R = H, Me) have been investigated.

A series of complexes in which the keto- or amidophosphine acts as a monodentate P ligand or as a neutral or anionic P,O chelating ligand have been synthesised and characterised.

Mo 0 dinitrogen complexes bearing electron-rich mono- and bidentate phosphines can be synthesized in good yields from inexpensive and readily accessible MoCl 5 via a one-step mild reduction with Mg metal.

trans-[(N 2) 2 Mo(PMePh 2)(PPh(CH 2 CH 2 PPh 2) 2)] can also be obtained via this r, in the presence of tri- and tetradentate ligands that are sterically restrictive, the Cited by: 8. Molybdenum complexes with linked cycloheptatrienyl–phosphane ligands proved to be particularly useful for applications in transition metal catalysis, and we have reported on the syntheses and properties of and electron complexes containing ortho-phenylene bridged ligands of the type (2-R 2 PC 6 H 4 C 7 H 6) (R=Ph, i Pr), which are capable to bind to the metal center in a chelating η Cited by: The stable, readily available molybdenum(II) complexes [Mo(CO) 4 Br 2] 2 (B) and Mo(CO) 3 (MeCN) 2 (SnCl 3)Cl (C) have been found to catalyze C−C bond-forming allylic substitution with electron-rich aromatics (e.g., 15 + PhOMe → 62) and heteroaromatics (e.g., 15 + 36 → 88) as nucleophiles under mild conditions (room temperature, 30 min−3 h).Remarkable is the para-selectivity for.

Heterobimetallic nickel and molybdenum complexes of the composition [Ni(L)MoO 2 (A) 4]nH 2 O (A = H 2 O (1), py (2), 2-pic (3), 3-pic (4), and 4-pic (5); n = 0, 2) and [Ni(L)(MoO 2)(BB) 2](BB = bpy (6) and (phen (7)) have been synthesized from the multidentate ligand disalicylaldehyde oxaloyldihydrazone (H 4 L) in methanol.

The composition of the complexes has been established. An efficient and general oxidative demetalation of (η3-allyl)molybdenum complexes using pyridinium dichromate allows the introduction of a carbonyl group at an allylic terminus of the π-system.

The process takes place with high regiocontrol and can lead to the preparation of unsaturated ketones and lactones of high enantiopurity. Journal of Organometallic Chemistry. () Elsevier Sequoia S.A., Lausanne Printed in The Netherlands Use of electron-rich ~-arylphosphine complexes of molybdenum(O) as ligands in group 6 metal carbonyl complexes Rudy L Luck and Robert H.

Morris * The Department of Chemistry and Scarborough College, University of Toronto, 80 St. George St. P P, H- ~'C-C\\ p, o ', o H2 P Considering the conclusions outlined recently [ 3 J.

the carbon dioxidethylene coupling reaction occurs in these systems by an initial carbon dioxide bonding (I 3 J through a vacant coordination position of an electron-rich ethylene metal complex.

The synthesis and characterization of two Group VI pentacarbonyl complexes (pfepp)M(CO) 5 (M = Cr 1, Mo 2; pfepp = PPh 2 C 2 F 5) are lysis of M(CO) 6 and pfepp in refluxing octane afforded 1 and 2 in moderate yields. These complexes were completely characterized by multinuclear NMR, IR and elemental analysis.

Synthesis and Protonation Studies of Molybdenum(0) Bis(di­nitrogen) Complexes Supported by Diphosphine Ligands ­Containing Pendant Amines † Liezel A. Labios Center for Molecular Electrocatalysis, Physical Sciences Division, Pacific Northwest National Laboratory, P.O.

BoxRichland, WashingtonUSA. Hydrothermal synthesis and structural characterization of the first mixed molybdenum-tungsten capped-keggin polyoxometal complex: {[Co(dien)]4[(As V O4)Mo V 8W VI 4O33(μ2-OH)3]}2H2O.

Dalton. This has been a direct result of the central role imide ligands play in the stabilization of metathesis catalyst of Mo, W, and Re. 27,32 In particular, four-coordinate molybdenum complexes of the type Mo(NAr)(C(H)CMe 2 Ph)(OR) have found widespread application in the controlled synthesis of polymers via ROMP.

75 PAGE Mechanistic studies by (1)H NMR spectroscopy show that upon two-electron reduction the Mo(CNR)2(bdt)2 complex dissociates the isocyanide ligands, followed by addition of acid to result in the.

A new series of molybdenum and tungsten tricarbonyl pincer complexes, bearing pyridine-based PONOP-type pincer ligands, have been synthesized and fully characterized. Electron-Rich Trichlorogermyl Complexes of Molybdenum and Tungsten Bearing a Cyclopentadienyl Ligand: Synthesis, Crystal Structures, and Cyclic Voltammetric.

J San Filippo, H.J Sniadoch, R.L Grayson, Chemical and spectroscopic studies of dinuclear molybdenum complexes, Journal of the Less Common Metals, /(77), 54, 1.

Molybdenum(0) and Tungsten(0) Complexes. We have recently reported the synthesis of molybdenum tricarbonyl complexes of the type [Mo(PNP)(CO) 3] (2a–c) by reacting [Mo(CO) 3 (CH 3 CN) 3], prepared in situ by refluxing a solution of [Mo(CO) 6] in CH 3 CN for 4 h, with the PNP ligands PNP-Ph (1a), PNP-iPr (1b), and PNP-tBu (1c) in 74–90% isolated yields.

13 The same procedure was. Synthesis and Reactivity of New Aminophenolate Complexes of Nickel Siqi Yu 1, Huan Wang 1, Jill E.

Sledziewski 1, Venkata N. Madhira 2, Cyrus G. Takahashi 2, Michelle K. Leon 1, Yulia B. Dudkina 3, Yulia H. Budnikova 3 and David A. Vicic 1,* 1 Department of Chemistry, Lehigh University, 6 E.

Packer Ave., Bethlehem, PAUSA. Ohki, Y., Aoyagi, K. & Seino, H. Synthesis and protonation of N-heterocyclic-carbene-supported dinitrogen complexes of molybdenum(0).

Organometall .New molybdenum complexes were prepared by the reaction of [MoVIO2(acac)2] or (NH4)2[MoVOCl5] with different N-substituted pyridoxal thiosemicarbazone ligands (H2L1=pyridoxal 4.The reactions of aminophosphines with Group 6 metal carbonyls afford both mono-substituted and disubstituted complexes.

The reaction of Ph2PN(H)C6H11 with molybdenum tetracarbonyl derivative gives.