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These are rare in essential oils with the exception of 1,8-cineole, also known as eucalyptol. Some oxides have the name ‘oxide’ at the end, making recognition easier.

FIGURE 3.21: 1,8-cineole, an oxide

1,8-cineole (eucalyptol) – see Figure 3.21 – is found in a number of oils and its major effect is due to its mucolytic property, useful in coughs, colds and any congestion in the respiratory tract. It can be a skin irritant and in this respect any oil containing a two-figure percentage needs to be used with restraint.

This group tends to be confusing, and it seems uncertain whether some oxides are in fact phenols or phenolic ethers – even experts have differing opinions or are not sure themselves. To be safe, give them the same consideration and prudent use as recommended for the phenols. 1,8-cineole may also be described as a bicyclic ether.¹³