... of conrd. hydrochloric acid was boiled under reflux for 24-48 hr. The dioxane was distilled under reduced pressure and the organic layer was extracted into ether. ... Perkin, Jr., (10) K. Alder and E. Windemuth, Ber., 71, 1839 (1838). J . Chem. Soc., 93,1959 (1908). Page 3. ...