Nickel complexes, with triaryl phosphites

Tetrakis(triaryl phosphite)nickel(O) and tetrakis(trialkyl phosphite)nickel(O) complexes have been prepared by the reaction of the desired phosphite with nickel carbonyl under forcing conditions and by the reaction of bis(cyclopenta-dienyl) nickel with the desired phosphite in an aromatic solvent. The present procedure is similar to the last-mentioned method. 

Rhodium and nickel have been by far the most common metals aside from palladium employed in Suzuki-Miyaura carbon-carbon bond-forming reactions. Platinum has been used on several occasions, for example Bedford and Hazelwood showed that platinum complexes with n-acidic, ortfto-metalated triaryl phosphite and phosphinite ligands exhibited what they termed unexpectedly good activity in Suzuki biaryl coupling reactions with aryl bromide substrates (Scheme 13.22). Application to aryl chlorides resulted in low conversion to the desired biaryl products. 

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