By E. Joy Bowles
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Extra resources for Chemistry Aromatherapeutic Oils
Different geographical locations are often associated with different chemotypes. For example, Rosemary oil from Spain is known as CT1 (CT, ‘chemotype’), and has higher levels of camphor, whereas Rosemary oil from Tunisia is known as CT2 and contains higher levels of 1,8-cineole. A third rosemary chemotype, CT3 from France, has higher levels of verbenone, which is thought to be a less toxic ketone than camphor. Not surprisingly, due to the similarity of its climate with Tunisia, Moroccan Rosemary oil is usually the CT2 chemotype.
Triple bonds are not very stable physically, which makes them reactive. Carbon-carbon triple bonds are very uncommon in essential oils. Carbon atoms are capable of forming many complex structures, due to their ability to form four bonds. 13 shows isobutane (C4H10) as a branched structure and cyclohexane (C6H12) as a closed ring. 13 Variability in structure of carbon-based molecules H H H H H C H H H H H isobutane C C C C H H C H H C H C C H H C H H H H H cyclohexane Most essential oil molecules have long carbon chains and require an even more abbreviated form of representation.
WHAT IS CHEMISTRY? 9 • • 13 An ethanol molecule H H H C C H H O H According to convention, in the simplest written formulae, carbon is mentioned first, hydrogen second, and oxygen last. Thus ethanol is written as C2H6O. The formula can also be written to give more information about the molecule’s structure, for example, CH3–CH2–OH. 9, you can see how the carbon atoms form the skeleton of the molecule. Yet another way of writing the formula highlights the placement of oxygen atoms in the molecule, for example, C2H5OH.
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