| 摘要 |
A process is disclosed for preparing bidentate ligands of the formula: <IMAGE> wherein: each Ar is independently selected from aromatic ring compounds having 6 up to 14 carbon atoms, e.g., phenyl, naphthyl, phenanthryl and anthracenyl; the x bonds and the y bonds are attached to adjacent carbon atoms on the ring structures; each R, when present as a substituent, is independently selected from alkyl, alkoxy, aryloxy, aryl, aralyky, alkaryl, alkoxyalky, cycloaliphatic, halogen, alkanoyl, alkanoyloxy, alkoxycarbonyl, carboxyl, cyano or formyl radicals; n is a whole number in the range of 0-4 where Ar is phenyl; 0-6 where Ar is naphthyl; and 0-8 where Ar is phenanthryl or anthracenyl; each R1 and R2 is independently selected from alkyl, aryl, aralkyl, alkaryl or cycloaliphatic radicals, or substituted derivatieves thereof; each R3 and R4 is independently selected from hydrogen and the R1 substituents; each of the above alkyl groups or moieties is straight or branched chain of 1-20 carbons; each aryl group contains 6-10 ring carbons; each cycloaliphatic group contains from 4-8 ring carbons; substituted derivatives include others, amines, amides, sulfonic acids, esters, hydroxyl groups and alkoxy groups. The invention process comprises coupling two molecules of a reactant of the formula: <IMAGE> wherein X is halogen, by maintaining a redox reaction system comprising said reactant, a polar aprotic solvent, a nickel compound and a reducing agent at a temperature and for a time sufficient to form the desired bidentate ligand.
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