Eucalyptus Polybractea Oil

#### Eucalyptus Polybractea. The leaves of this tree give a very good yield of an essential oil which contains up to 92% **Cineole**. Thus, the oil is of the pharmaceutical type (here named **Eucapharma **oils). It is the most important of all the exported Australian eucalyptus oils. It is furthermore distinguished by the fact that it does not contain the unpleasantly smelling lower aIdehydes found in **Globulus **and other **Eucapharma **oils; thus, a well distilled **Polybractea **oil may not require redistillation. Distillation is undertaken only in southeastern Australia. Oil of **Eucalyptus Polybractea **is a colorless to pale yellow mobile liquid of strong but somewhat sweet-camphoraceous and fresh- cooling odor, and it has a similar taste. Its dryout on a perfume blotter is distinctly different from that of a **Globulus**** **or similar oil: it is not woody- sweet or heavy, "paint"-like; as a matter of fact, there is hardly any dryout note at all, but just a clean fadeout. The main use of this oil is in pharmaceutical preparations, cough-drops, gargles, mouth-washes, toothpaste, etc. as is the case with all the other eucapharma oils. Oil of **Eucalyptus**** ****Polybractea**** **is readily available in large quantities, but since it is produced in Australia only, there may be a considerable shipping delay for certain customers. This oil is an excellent starting material for the isolation of **Cineole**, also called eucalyptol. This material is simply frozen out of the oil (cineole congeals at about + 1° C.).