1986 Volume 43 Issue 3 Pages 161-164
Colloidal palladium with an average diameter of 18Å was prepared by reducing palladium (II) chloride with methanol in the presence of poly (N-vinyl-2-pyrrolidone). The colloidal palladium exhibited high activity as a catalyst for hydrogenation of 1, 5-, 1, 4-, 1, 3-, and 2, 4-hexadiene. The hydrogenation produced the corresponding monoene at high selectivity. Examination of the isomer distributions of the produced monoene showed that isomerization of monoenes was prohibited in the presence of dienes. The hydrogenation of conjugated diene proceeded through both 1, 2- and 1, 4-addition. The ratio of 1, 2- to 1, 4-addition depended on the structure of the dienes.
