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Journal ArticleDOI

Phosphine complexes of the early metals and the lanthanoids

01 Jan 1991-Pure and Applied Chemistry (International Union of Pure and Applied Chemistry)-Vol. 63, Iss: 6, pp 845-850
TL;DR: The coordination chemistry of the mixed-donor tridentate ligand -N(SiMezCH2PR2)2 with the early transition metals of groups 3 and 4 and the lanthanide elements is presented in this paper.
Abstract: The coordination chemistry of the mixed-donor tridentate ligand -N(SiMezCH2PR2)2 with the early transition metals of groups 3 and 4 and the lanthanide elements will be presented. This ancillary ligand has allowed for the formation of phosphine complexes of these hard elements which has in turn induced new reactivity patterns for hydrocarbyl ligands. The stability and reactivity of metal complexes are a function of both the position of the metal in the periodic table and the nature of the ligands. While the former provides for diverse chemical reactivity, it is

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TL;DR: In this article, frustrated Lewis pairs have been used to accelerate the activation of inert chemical bonds, which is central to the development of a sustainable energy system and is the basis for our work.
Abstract: Bond activation and catalysis are central to the development of a sustainable energy system. Frustrated Lewis Pairs have conceptually revolutionized the activation of inert chemical bonds. Far less...

47 citations

Journal ArticleDOI
TL;DR: Schiff bases are a vast group of compounds characterized by the presence of a double bond linking carbon and nitrogen atoms, the versatility of which is generated in the many ways to combine a variety of alkyl or aryl substituents as mentioned in this paper .
Abstract: Schiff bases are a vast group of compounds characterized by the presence of a double bond linking carbon and nitrogen atoms, the versatility of which is generated in the many ways to combine a variety of alkyl or aryl substituents. Compounds of this type are both found in nature and synthesized in the laboratory. For years, Schiff bases have been greatly inspiring to many chemists and biochemists. In this article, we attempt to present a new take on this group of compounds, underlining of the importance of various types of Schiff bases. Among the different types of compounds that can be classified as Schiff bases, we chose hydrazides, dihydrazides, hydrazones and mixed derivatives such as hydrazide–hydrazones. For these compounds, we presented the elements of their structure that allow them to be classified as Schiff bases. While hydrazones are typical examples of Schiff bases, including hydrazides among them may be surprising for some. In their case, this is possible due to the amide-iminol tautomerism. The carbon–nitrogen double bond present in the iminol tautomer is a typical element found in Schiff bases. In addition to the characteristics of the structure of these selected derivatives, and sometimes their classification, we presented selected literature items which, in our opinion, represent their importance in various fields well.

40 citations

Journal ArticleDOI
TL;DR: In this article, the preparation of new four and five-coordinate aluminum amido diphosphine complexes was reported and the reaction of the potentially tridentate ligand precursor LiN(SiMe2CH2PPri2)2 with AlCl3 in tolu...

33 citations

Journal ArticleDOI
TL;DR: Treatment of one equivalent of 1 or 2 with two equivalents of [(cod)CuCl] results in the formation of the polycyclic tetranuclear complex [[O(SiMe2Ap)2]2Cu4] (8).
Abstract: The reaction of [[O(SiMe2Ap)2)2LnLi(thf)n] 1 (Ln = Nd, n= 2) and 2 (Ln = La, n = 3) in hexane with [(dme)NiCl2] (dme = dimethoxyethane) and [(cod)PtCl2] (cod = 1,5-cyclooctadiene) leads to the dimeric Ni complex [[O(SiMe2Ap)2]2Ni2] (3) and the mononuclear platinum compound [O(SiMe2Ap)2Pt] (4). respectively (O(SiMe2ApH)2 = bis(4-methyl-2-pyridylamino)tetramethyldisiloxane). Compounds 3 and 4 have been characterized by X-ray crystal structure analysis. The ligand-transfer reactions probably proceed via heterobimetallic intermediates. A model complex of such an intermediate [[O(SiMe2Ap)2)2NdPdMe] (7) was isolated by reacting 1 with [(cod)PdMeCl]. Applications of complex 3 in ethylene oligomerization were investigated. Highly branched oligomers with a very narrow molecular weight distribution (Mn =230 gmol(-1) (relative to polystyrene standards), Mw/M= 1.14) are produced when Et3Al2Cl3 is employed as a co-catalyst and CH2Cl2 as the solvent (TOF = 122000 h(-1). Treatment of one equivalent of 1 or 2 with two equivalents of [(cod)CuCl] results in the formation of the polycyclic tetranuclear complex [[O(SiMe2Ap)2]2Cu4] (8). An X-ray crystal structure analysis of 8 shows channels formed by a series of fourteen-membered rings in the solid state.

27 citations