Organometallic compounds biaryls

Pd(0) complexes catalyse reactions of aryl halides with various organometallic compounds which lead to biaryls, phenylethenes, ketones, amines and ethers. 

The formation of unsymmetric biaryls via catalytic cross-coupling of aryl halides and organometallic compounds has been shown to proceed in ionic liquids with enhanced activity. The Suzuki-Miyaura cross coupling (cf. Section 2.11)... 

The quadratic NLO active molecules are mostly based on donor-acceptor substituted aromatics benzene, stil-benes, diaryl acetylenes, diacetylenes, and biaryls are commonly used frameworks. In addition to the above materials, many more organic and organometallic compounds were examined by the powder SHG method, or their molecular hyperpolarizabilities were measured using EFISHG/HRS techniques, or both.t >... 

The chiral center most frequently encountered is the asymmetric carbon atom, a tetrahedral C atom, bonded to four different substituents. Chiral centers of this type are known for many other elements (4). However, chiral centers are also found in other polyhedra, e.g., the metal atoms in octahedral compounds containing three bidendate chelate ligands. Chirality axes, present in the atrop isomers of ortho-substituted biaryls, occur in coordination chemistry in appropriately substituted aryl, pyridyl, and carbene metal complexes. Well known examples of planar chirality in organometallic chemistry are ferrocenes, cymantrenes, and benchrotrenes containing two different substituents in 1,2- or 1,3-positions relative to each other (5-5). 

In a long series of papers, Oae and his group have studied the formation of biaryl compounds by ligand coupling occurring on a a-sulfurane, formed by nucleophilic addition of an organometallic species on the sulfur atom of the sulfoxide substrate E)epending on the nature of the two substituents... 

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