Page 1. Tetrahedron Letters,Vol.27, No.1, pp 69-70,1986 0040-4039/86 $3.00 + -00 ... Hydrogenolysis of the dioxolane moieties of a-9 was carried out in the presence of palladium black and p-toluenesulfonic acid (5-12 mol% based 69 Page 2. 70 Scheme 1. Table. J H H ...