method of idroformilazione of a compound etilenicamente insaturo impiegante as catalyst in a complex with the ligand difosfonico

摘要

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 DEG and not more than about 180 DEG , 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.