( )-endo-beta-bergamotene
Bergamotenes are a group of isomeric chemical compounds with the molecular formula C15H24. The bergamotenes are found in a variety of plants, particularly in their essential oils. There are two structural isomers, α-bergamotene and β-bergamotene, which differ only by the location of a double bond. Both of these isomers have stereoisomers, the most common of which are known as the ''cis'' and ''trans''-isomers (or endo- and exo-isomers). α-Bergamotene is found in the oils of carrot, bergamot, lime, citron, cottonseed, and kumquat. Pheromones The bergamotenes are pheromones for some insects. For example, β-''trans''-bergamotene is a pheromone for the wasp '' Melittobia digitata''. Plants can defend themselves against attack by herbivorous insects by producing pheromones such as bergamotenes that attract predators of those herbivores. In a more complex relationship, the tobacco plant ''Nicotiana attenuata'' emits α-''trans''-bergamotene from its flowers at night to attrac ...
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