Eucalyptus, oils

An optically active, secondary terpene alcohol. ( —)-Piperilol is found in various eucalyptus oils and (-l-) piperitol in the oil from a species of Andropogon. A somewhat viscous oil of pleasant smell. It yields piperitone on oxidation with chromic acid. 

Cineole is the chief component of eucalyptus oil it has the molecular formula CjoHigO and contains no double or triple bonds It reacts with hydrochlonc acid to give the dichlonde shown... 

Oil-free alkyds Oil from seeds Oil-in-water emulsion Oil laundering Oil length Oil mining Oil of anise Oil of bergamot Oil of eucalyptus Oil oflemon Oil of Olay Oil of Palma Christi Oil of turpentine Oil Orange Oil-pump Oil reclaiming Oil recovery... 

Rectified oils have been redistilled to improve a particular property or characteristic, such as flavor or aroma. Eor example, natural oil of peppermint is frequently rectified to remove dimethyl sulfide, which has a powerful and objectionable cooked vegetable note deleterious to the use of the oil in cmme de menthe Hqueurs. Distillation is also used to remove psoralens, which are harmful photosensitizing agents present in natural bergamot oil. Color may be removed, eg, from cassia oil, by vacuum steam distillation. A desirable component, such as 1,8-cineole (eucalyptol) 85% in eucalyptus oil, may be... 

Some of the other eucalyptus oils of commercial importance iaclude the Chinese eucalyptus, a camphor/ciaeole-type oil E. citriodora Hook, a citroaeUal-type oil E. staigeriana F.v. Muel., a citral-type oil and E. macarthuri H. Deane Maiden, a geranyl acetate-type oil. 

The whole question of cineol determination in eucalyptus oil has recently been catefully. studied by Turner and Holmes, who consider that all methods so far published arc either inaccurate or at best only Approximate. They suggest the following process... 

There are a few componnda which have been described as occurring iu eucalyptus oils, which are, so far as is kuow n, nOl found in other oils. 

The following are the principal varieties of eucalyptus oil that have been described —... 

This tree is the Letnoo-sceoted Iron-bark of Queensland, ihe essential oil heioir o pacticolar interest, as it differs eotirelf from ordinary eucalyptus oils. The oil haa the following charaeu ra. —... 

He found that the d-phellandrene from elemi and bitter fennel oils were identical, and that i-phellandrene from eucalyptus oil is the laevo-rotatory variety of the same terpene. To these he assigned the names d-a-phellandrene and i-a-phellandrene. The d-phellandrene from water fennel oil differs from these and is named d-/3-phellandrene. The following are the characters of the purest specimens of natural phellandrene yet obtained —... 

Baker and Smith have isolated from a number of eucalyptus oils, a sesquiterpene to which they have given the name aromadendrene. This compound was separated from the oil of eucalyptus nova-angelica in the dextrorotatory form, and from the oil of eucalyptus baUeyana in the laevorotatory form. The two specimens had the following characters —... 

Eudesmene is a sesquiterpene obtained by the dehydration of eudesmol, the sesquiterpene alcohol found by Baker and Smith in several species of eucalyptus oil. It has the following characters —... 

Isoamyl alcohol, (CH3)2. CH. CHjCHjOH, has been found in the free state in various eucalyptus oils, and also in geranium, lavender, and peppermint oils. It boils at 131° and jdelds a phenyl-urethane, melting at 53°. 

Piperitol is a secondary alcohol, corresponding with the ketone, piperitone, occurring in several of the so-called peppermint group of eucalyptus oils. ... 

Cumic aldehyde, or isopropyl-benzaldehyde, is present in cummin oil and in the oils of boldo leaf, cassie flower oil, and, probably, in certain eucalyptus oils. It is an oil of powerful odour, having the formula C,gHi.20. Its characters are as follows —... 

This aldehyde has been isolated from various Eucalyptus oils by Baker and Smith. It has a pleasant odour resembling that of cumic aldehyde, with which Schimmel Co. have considered it to be identical. This, however, is improbable, and Baker and Smith consider it to have the formula CjHjjO, which would make it to be a lower homologue of the terpenic aldehydes. Its physical characters, however, are somewhat doubtful, as specimens isolated from the oils of Eucalyptus hemiphloia and Eucalyptus salubris show. These are as follows —... 

This ketone occurs in eucalyptus oils derived from a particular group of trees, the leaves of which have the venation characteristic of species yielding phellandrene-bearing oils. It follows the general rule for all constituents in eucalyptus oils, increasing in amount until the... 

Australol is a crystalline phenol obtained by Baker and Smith from various eucalyptus oils, including those of Eucalyptus hemiphloia and E. wooloiana. It is a very caustic substance, resembling ordinary phenol in odour. Its characters are as follows —... 

The quantitative determination of cineol has been fully dealt with in Vol. I. of this work under Eucalyptus Oil, hut as this body occurs in various other oils, and its determination is a matter of considerable importance, details of its estimation are also dealt with here. 

Baker and Smith have devised an improved rapid method which they find works well with oils containing 20 per cent, and over. Eucalyptus oils which give a compound that cannot be satisfactorily pressed by the British Pharmacopoeia method may be readily determined in this way and the decomposition of the cineol phosphate by long pressing (particularly in hot countries) is prevented. 

This method cannot be relied on, as the action o.f potassium permanganate is such as to react with some and not with other bodies present in various types of eucalyptus oil. 

Principal ingredient of eucalyptus oils, isolated after separation of remaining terpenes with sulfuric acid. Reference(s) ... 

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