Heussler (translated by Pond), The Chemistry of the Terpenes (London, 1904).
TERPENES, in organic chemistry, the generic name of a group of hydrocarbons of the general formula (C 5 H 8) n, and the more important oxygen derivatives, mainly alcohols, aldehydes and ketones, derived from them.
C 5 H 8; terpenes proper, CroHis; sesquiterpenes, C15H24; and polyterpenes (C5H8)n.
In addition to these, a series of open-chain olefine terpenes is known.
The chief sources of the terpenes and their derivatives are the essential oils obtained by the distillation or extraction by pressure of various plants, chiefly of the Coniferae and different species of Citrus.