... Catalytic reduction in the presence of palladium-charcoal (10%) in glacial acetic acid as solvent (18) D. H. Shirley, Preparation of Organic Intermediates, (19) D. A. Shirley, roc. cif., p. 222. ... (25) Cf. A. Roe and H. L. Fleishmann, J. Am. Chem. SOC., 69, 509 (1947). ...