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On the reuse of rhodium(I) bisphosphine complexes in catalytic homogeneous hydrogenation of 2-acetamidoacrylic acid

1982; Elsevier BV; Volume: 239; Issue: 1 Linguagem: Inglês

10.1016/s0022-328x(00)94099-3

1872-8561

Akira Uehara, John C. Bailar,

Innovative Microfluidic and Catalytic Techniques Innovation

The cationic rhodium(I) complexes having the general formulas, [Rh(cod)-p-p)]Cl and [Rh(p-p)Cl]2, were prepared and investigated as homogeneous catalysts for the hydrogenation of 2-acetamidoacrylic acid: (cod is 1,5-cyclooctadiene and p-p is one of bisphosphines such as bis(1,2-diphenylphosphino)ethane (diphos), 2,2′-bis(diphenylphosphino)biphenyl (bpbp) and ()-2,3-o-isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane (()-diop)). It was found that these catalysts can be used repeatedly in the above hydrogenations and that the chloride ion plays an important role in the repetitive utilization because these complexes are probably maintained as [Rh(p-p)Cl]2 during and after the work-up procedures of the product.