Abstract
The present report deals with two kinds of sesquiterpene and their dehydrogenation products. The results of our investigation can be summarized as follows: (1) Japanese thuja tree oil (Thujopsis dolabrata S. et Z.) gives, on the fractional destillation, a sesquiterpene (bp. 114°/5mm.; [n]16D1.5124; d1640.9372) at the rate of 13% of the oil in weight. (2) When this sesquiterpene is dehydrogenated with powdered S, a small amount of cadalene is obtained. Cadalene picrate is yellow orange; mp. 114_??_115°C. (3) Blue camphor oil gives, on fractional destillation, a sesquiterpene fraction (bp. 128°/10mm.; [n]10D1.5087) at the rate of 14% or the oil in weight, and from this fraction a considerable amount of azulene is formed on dehydrogenation. This azulene is almost identical in its ultraviolet spectrum with PLATTNERS, S-guaiazulene. The picrate of our azulene is dark brown, mp. 121_??_122°C.
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