'l'hc completc ana!ysis of the neutral volatile oil of the leaves of Eastern white cedar ( T l~l r j a occider~lalis L.) by means of gas-liquid chromatography \\.as attempted. The mixture of terpcnes was resolved into 28 nlonoterpenoid components and the major ones were isolatcd in 5-to 20-mg amounts. Cornparis011 of infrared spectra and retention times with those of authentic specimens led to the positive identification of d-e-pinene, camphene, sabinene, d-limoncne, p-cymene, yterpinene, 1-fenchone, 1-e-thujone, d-isothujone, camphor, and bornyl acetate. e-Th~ijene, P-pinene, myrcene, 1,8-cincole, tcrpinolene, and terpinen-4-01 were tentatively identified. 'The percentage composition of a comrncrcial sample of the oil and of one obtained from a tree grown in Sasltatoon was determined. The latter oil contained 7.0 to 7.5% of sesq~~iterpenoicl components, which were resolved into four peaks on polyester columns ;it 180" C.
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