樟腦類の研究(其一)
1925 年 1925 巻 524 号 p. 882-884
詳細
1925 年 1925 巻 524 号 p. 882-884
On the Formation of Camphor from Turpentine Oil. The anhydrous oxalic acid and turpentine oil with the aid of catalyzers yielded the oxalate of borneol (this journal No. 507, 341-47, 1924), which gave by saponification d or l-borneol on the nature of the turpentine oil used. D or l-borneol gave d or l-camphor by oxidation, which had [α]17D=+15.00°and [α]13D=-11.30°respectively. Formation of Camphor from Camphane-2-carboxylic Acid. 10 grams of camphane carboxylic acid were dissolved in a slight exess of dilute solution of caustic potash, gradually mixed with 30 grams of potassium permanganate, and the whole warmed on a water bath until oxidation was completed, the sublimating white krystalline substance was collected. It melted at 175°after purification, and was proved to be camphor by conversion into semicarbazone, which melted at 235°.
