2 edition of synthesis and reactions of cationic alkyl complexes of group (IV) transition metals. found in the catalog.
synthesis and reactions of cationic alkyl complexes of group (IV) transition metals.
Andrew J. Jaggar
Thesis (Ph.D.), University of East Anglia, School of Chemical Sciences, 1992.
Organometallic chemistry belongs to the most rapidly developing area of chemistry today. This is due to the fact that research dealing with the structure of compounds and chemical bonding has been greatly intensified in recent years. Additionally, organometallic compounds have been widely utilized in catalysis, organic synthesis, electronics, etc. The synthesis, characterization, and unprecedented catalytic activity of cationic aluminum alkyl complexes toward hydrosilylation are described. X-ray crystallographic analysis of Tp*AlMe₂ (1) and [Tp*AlMe][I₃] (3) revealed the preference of Al for a tetrahedral coordination environment and the versatility of the Tp* ligand in stabilizing.
Reactions Catalyzed by Low-Valent Ni(0) Complexes. The above carbonyl-ene reactions catalyzed by cationic Lewis acid complexes represent a major advance in the field in terms of both efficiency and chiral induction. A wide range of simple alkenes can be used as substrates and are especially selective in carbonyl-ene reactions of glyoxylate. Hydrolysis Williamson ether synthesis Nitrile formation Amine formation Alkene formation Grignard formation My Preferences; My Reading List Reactions: Alkyl Halides. Hydrolysis. Williamson ether synthesis. Nitrile formation. Amine formation. Removing #book# from your Reading List will also remove any bookmarked pages associated with.
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 versatility of isocyanides (CNR) in organic chemistry has been tremendously enhanced by continuous advancement in transition metal catalysis. On the other hand, the urgent need for new and more sustainable synthetic strategies based on abundant and environmental-friendly metals are shifting the focus towards iron-assisted or iron-catalyzed reactions. Diiron complexes, .
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The chemistry of cationic group 4 organometallic complexes has developed rapidly since the mids. 1 The postulated role of cationic metal alkyl species in homogeneous Ziegler–Natta catalysis, 2 which is now well established for cationic biscyclopentadienylmetal alkyl systems, has resulted in an explosive growth of this field.
Cationic alkyl complexes of the rare‐earth metals [LnR m (L) n] (3–m)+ (R=alkyl; m=1, 2; L=Lewis base) were virtually unknown species until recently. Because of their increased Lewis acidity/electrophilicity they should have considerable potential as homogeneous catalysts in olefin polymerization and in organic by: S.
Schulz, in Comprehensive Organometallic Chemistry III, Anionic Derivatives. Anionic group 13 metallates [MR 4] − are very well known in a group 13 organometallic chemistry.
They have been prepared in a large number by reactions of MR 3 and metal hydrides, alkyls, aryls, and tetraalkyl ammonium halides. Numerous alkyl- and aryl-substituted. The synthesis and reactivity of the cationic niobium and tantalum monomethyl complexes [(BDI)MeM(N t Bu)][X] (BDI = [Ar]NC(CH 3)CHC(CH 3)N[Ar], Ar = 2,6-i Pr 2 C 6 H 3; M = Nb, Ta; X = MeB(C 6 F 5) 3, B(C 6 F 5) 4] was cationic alkyl complexes failed to irreversibly bind CO but formed phosphine-trapped acyl complexes [(BDI)(R 3 PC(O)Me)M(N Cited by: Neutral and Cationic Aluminum Complexes Supported by Sterically Bulky Amidinate Ligands.
Organometallics21 (11), DOI: /om Fabien Delpech, Ilia A. Guzei, and, Richard F. Jordan. Cationic Indium Alkyl Complexes Incorporating Aminotroponiminate by: The chemistry of cationic group 3 metal and lan-thanide alkyl complexes is still in its infancy, compared to that of the transition metals.
The latter have been intensively investigated, especially because of their high activity in catalytic olefin polymerization.1 The recent progress made in the synthesis of cationic group 3 metal.
Introduction. Transition metal alkyl complexes play a critical role in a variety of important organometallic reactions such as olefin polymerization and hydroformylation.
Early attempts to synthesize these complexes were unsuccessful, so it was originally thought that such species were inherently unstable due to weak metal-carbon bonds. Neutral and Cationic Group 13 Alkyl and Hydride Complexes of a Phosphinimine−Amide Ligand.
Organometallics23 (8), DOI: /om Lan-Chang Liang, Mei-Hui Huang, and, Chen-Hsiung Hung. Aluminum Complexes Incorporating Bidentate Amido Phosphine Ligands. Yttrium dialkyl complexes [,-R-tacn--(CH)NBu]Y(CHSiMe) (R = Me, Pr; tacn = 1,4,7-triazacyclononane) were prepared; when activated with [PhNMeH][B(CF)] these complexes form cationic alkyl species that are active ethene polymerisation catalysts.
Reactions of Allyl Complexes. All of Chapter 19 of Collman, Hegedus, Norton and Finke is dedicated to reactions of trihapto allyl complexes. Allyl complexes have a rich and useful chemistry, particularly in organic synthesis.
Listed here are just a few of the most common reactions of allyl complexes: With nucleophiles (Eq 5). Reactions of 6b‐d, 6e and 6g with palladium derivatives resulted in mononuclear complexes with ligands showing either bi‐ or tridentate coordination modes as shown in Scheme 11a–c.
Palladium complexes of PCLs with bidentate P,N‐coordination modes have been reported by Gandelman and co‐workers (Scheme 11a). The synthesis of new cationic surfactants i.e., n‐hexyl‐3‐methylpyridium bromide (a) and n‐octyl‐3‐methylpyridium bromide (b), and their characterization using multinuclear nuclear magnetic resonance spectroscopy (NMR) (1 H, 13 C) and Fourier‐transform infrared spectroscopy (FT‐IR) spectroscopic techniques were micellization behavior of the synthesized.
Cationic Ir(III) alkyl and hydride complexes: stoichiometric and catalytic C–H activation by Cp∗(PMe 3)Ir(R)(X) in homogeneous solution Steven R. Klei, Jeffrey T. Golden1, Peter Burger2, Robert G. Bergman∗ Department of Chemistry and Center for New Directions in Organic Synthesis, CNDOS, University of California.
Synthesis and Surface Properties of Novel N-Alkyl Quinoline-Based Cationic Gemini Surfactants. Journal of Dispersion Science and Technology: Vol. 34, No.
4, pp. New dialkyl, diamido, and cationic amido group 3 metal complexes of amidine‐amidopyridine ligands, some featuring β‐Si–HLn agostic interactions, evidenced in the solid state and by 29Si NMR spectr.
Recent studies point out that bolaamphiphiles can be used in nonviral gene therapy. Due to their bipolar character, they may span a membrane and thus stabilize or destabilize it which could be relevant for DNA transfer across a biological membrane. Since there are only very few studies on bolaamphiphile application in DNA transfection, it is difficult to assess whether they will bring.
Well, I'm right here. I have my alkyne. And I want to make it from acetylene. So I'm going to do an alkylation reaction. And because I only need one alkyl group, I'm only going to do it one time.
So I'll need a one-time alkylation reaction. And the first step you add is very strong base, sodium amide. In the second step you add a primary alkyl. This unified presentation of cationic polymerization discusses initiation, propagation, transfer, and termination in cationic polymerizations of alkenes and heterocycles.
It also elucidates the mechanisms of the reactions involved in all carbocationic and ring-opening polymerizations. It is written by internationally acclaimed experts in their resp.
This chapter discusses the chemistry of cationic dicyclopentadienyl group 4 metal–alkyl complexes. Neutral, d0 group 4 metal alkyl complexes of general form Cp2 M(R)2 (R = H, hydrocarbyl) or Cp2. The activity of catalytic systems on the basis of the Ni(0) phosphine complexes and the Lewis acids in the low-molecular oligomerization reactions of olefines is determined by the cationic.
The synthesis, structures, and reactivity of cationic aluminum complexes containing the N,N'-diisopropylaminotroponiminate ligand (i Pr 2-ATI-) are reaction of (i Pr 2-ATI)A1R 2 (1a-e,g,h; R = H (a), Me (b), Et (c), Pr (d), i Bu (e), Cy (g), CH 2 Ph (h)) with [Ph 3 C][B(C 6 F 5) 4] yields (i Pr 2-ATI)A1R + species whose fate depends on the properties of the R ligand.
1a and .Organic Synthesis Using Transition Metals, 2nd Edition considers the ways in which transition metals, as catalysts and reagents, can be used in organic synthesis, both for pharmaceutical compounds and for natural products.
It concentrates on the bond-forming reactions that set transition metal chemistry apart from "classical" organic chemistry.Synthesis and some reactivity of cationic alkyl nitrosyl iridium(III) derivatives.