樟腦類の研究(其一)  [in Japanese] Studies on Camphor Group. I.  [in Japanese]

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]^<17>_D=+15.00°and [α]^<13>_D=-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°.