Hydroformylation using improved catalysts comprising rhodium and

Details Hydroformylation using improved catalysts comprising rhodium and Hydroformylation using improved catalysts comprising rhodium and

1977-03-31

1979-02-13

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 4508

Patent

active

041395654

ABSTRACT:
In hydroformylating an ethylenically-unsaturated compound to produce a formyl-substituted derivative using as catalyst rhodium hydrido carbonyl in complex combination with a disphosphino ligand, a high ratio of the normal aldehyde to the iso-aldehyde in the product can be obtained even at very low ratios of ligand to rhodium in the catalyst mixture by using as the ligand a cyclic compound having in the ring two adjacent carbon atoms between the trans position of which the minimum and maximum attainable dihedral angels are, respectively, at least about 90.degree. and not more than about 180.degree., each of these adjacent carbon atoms being substituted with a phosphinomethyl group, the phosphinomethyl groups being in trans relationship to one another. If there are maintained in the reaction zone at least about 1.5 moles of the ligand per atom of rhodium, the desired results are obtained and higher ligand:rhodium ratios are not necessary.

REFERENCES:
patent: 3239566 (1966-03-01), Slaugh et al.
patent: 3527809 (1970-09-01), Pruett et al.

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