Hydrogenation of beta -furylpropionic acid on catalysts containing certain metals of group VIII
The conversion ofβ -furylpropionic acid was investigated in hydrogenation in a flow-type system at atmospheric pressure on Rh-C, Pd-C, Pd-Al, and Ni-ZnO at 250 and 265°.
Hydrogenolysis of the furan ring proceeds smoothly on a rhodium catalyst, forming γ-ketoenanthic acid, which is converted to 5-propylbutyrolactone as a result of cyclization with liberation of water and hydrogénation. The yield of 5-propylbutyrolactone reaches 60% of the theoretical at 265°.
Hydrogenolysis of the double bonds of the furan ring proceeds to a considerable degree on Pd -C, and at 250°C,β -tetrahydrofurylpropionic acid is formed in up to 40% yield. In this case, an increase in the temperature promotes hydrogenolysis of the furan ring.