Ocimene, Described in Four Lines

So what exactly is ocimene?

Short answer, before any chemistry: a terpene. Terpenes are the aromatic compounds of the plant world, hundreds of them have been named, and the volatile part of that group is what carries a plant's characteristic scent [1]. Ocimene is one entry on that list. Most writing about terpenes stops at family level, which is fair enough, since that is usually how the research describes them [1]. A general introduction covers the whole volatile fraction. It won't tell you what sits in one particular bottle. That belongs with the product, which is why contents are listed per product in our catalogue rather than in an article like this one. So read this page as chemistry, not as a label. What a single terpene does inside the body is a separate question, and the fraction tends to be studied together rather than one molecule at a time [1]. Four lines hold most of what is documented about ocimene, and they are the same four you will find in our terpene chart:

• Classification: a terpene, one of hundreds of aromatic plant compounds [1]
• Chemical family: acyclic monoterpene
• Signature aroma: sweet, herbaceous, green, woody
• Approximate boiling point: around 100 °C

The chemistry, in plain words

Acyclic: an open chain, not a ring

Two words carry the whole classification. Acyclic describes the shape of the carbon skeleton: it runs as an open chain instead of closing into a ring. That structural detail is what sets ocimene apart from the ring-shaped members of the same family, and it is the reason the entry reads acyclic monoterpene rather than monoterpene alone. Monoterpene, the second half, sets the size class within the terpene group and places ocimene at the lighter, more volatile end of it. Neither word is exotic. They are filing categories, and once you know what they file, the line becomes readable.

One name among hundreds

Hundreds of aromatic compounds have been identified in plants, and terpene is the group name for them [1]. Ocimene is a single line on that list. Which is also why single-compound stories stay short: work such as Russo's 2011 paper describes the aromatic fraction as a whole rather than molecule by molecule [1]. So the honest position on ocimene by itself is a modest one. The classification is clear. The aroma descriptors are recorded. Past that, compound-specific evidence remains thin, and we would rather say so than fill the space.

The aroma notes, written down

Sweet, herbaceous, green, woody

Four descriptors, meant to be read together rather than picked apart. Sweet points at the sugary edge of the note. Herbaceous sends you towards leaf and stem instead of flower. Green is the register of fresh plant material. Woody sits underneath as the drier base. That combination is the standard shorthand used to place ocimene on an aroma map, and it is the version printed in our chart. Short profile, four coordinates, no adjectives added for decoration.

Why four words instead of one

Because smell does not reduce well to a single word. A descriptor set works like a position on a grid: each word narrows the space, and together they get close enough for someone else to recognise. Individual noses also differ, so a profile is a reference point rather than a verdict. And in a plant, the volatile compounds rarely turn up alone; the fraction arrives as a mixture, which is how it is usually described in the literature [1]. Worth keeping the two questions apart, too. What a molecule smells like and what it does are not the same enquiry, and the second one is not settled by an aroma profile.

Around 100 °C, and what the number isn't

A place on the volatility scale

The approximation sign in front of that figure is there on purpose. Roughly 100 °C marks where ocimene sits among the volatile compounds, relative to its neighbours. It is not a fixed physical constant to build calculations on, and it is not a threshold where something switches on or off. Published values for aroma molecules shift with method and conditions, so the number stays approximate in our chart. Read it as a position. Nothing more precise is claimed here, because nothing more precise is warranted.

From the whole fraction to one bottle

A terpene introduction describes the fraction. A product entry describes contents. Both are useful, in their own places, and mixing them up is where confusion usually starts. Since 2014 our answer to the second question has been the same: what is in a product is listed with that product, per product, alongside the batch analysis. So if the real question is whether a specific oil carries a specific terpene, the catalogue entry answers it. This page only answers what the molecule is.

Ocimene, data point by data point