Alkoxides heteroleptic

A large variety of cuprates are known nowadays. They include heteroleptic derivatives R(Y)CuM (Y = alkynyl, halide, amido, alkoxide, thiolato, phosphide M = Li or Mg), and have found widespread application in organic chemistry. Their syntheses and applications are discussed in the other chapters of this book. In addition, compounds in which the copper to lithium (or magnesium) ratio differs from 1 1 are also known examples are R3CuLi2 and the so-called higher order cyanocuprates introduced by Lipshutz et al. [99]. 

HETEROLEPTIC METAL ALKOXIDES CONTAINING CARBOXYLATO-, p-DIKETONATO, AND AMINOALKOXIDE LIGANDS... 

The most important ways to prepare heteroleptic complexes are (1) the reaction of chemical modification, (2) the interaction of an alkoxide with a carboxylate, p-diketonate, or other derivative of the same or the other metal, and (3) reactions of alcoholysis of derivatives initially not containing alkoxoli-gands. 

The major types of the molecular structures for the heteroleptic derivatives appear to be the same or very close to those characteristic of homoleptic alkoxides. They can be classified as follows ... 

Unfortunately, length restrictions did not permit us to consider in detail the tremendous amount of information available on heteroleptic complexes, which are briefly reviewed in Chapter 7. The reviews do not consider a broad group of autocomplexes — derivatives of nitro-, aminophenols, ketoenols, and also chloro-, bromo-, and iodophenols that are stable to hydrolysis and are only formal analogs of alkoxides and phenoxides. 

A few classic heteroleptic complexes were sythesized involving additional lanthanide iodide [146], cyclopentadienyl [147,149], amide [141], alkoxide... 

Mononuclearity in Ln(II) CH-alkoxides has not yet been proven by X-ray crystallography [28,55,56]. The dimeric heteroleptic complex (Yb[N(SiMe3)2] ( -tritox) 2 established the alkoxide ligand as the bridging moiety [28]. Mono-europium(II) complexes with tri-fert-butoxygermanate-, -Stannate and -plum-bate ligands were reported and Eu [Sn(OtBu)3]2 was characterized by X-ray structure analysis (Table 2) [55b]... 

Metal aUcoxides and alkyls are useful starting materials, particularly for the preparation of some unsolvated P-diketones that require anhydrous conditions (see Section 3.3). Addition of /3-diketonate ligands to metal alkoxides has also been used to produce heteroleptic metal complexes that are less reactive than the homoleptic metal alkoxides this simplifies the use of such complexes in chemical vapor deposition applications. ... 

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