Most insect pheromones are relatively simple molecules — long-chain alcohols, acetates, or aldehydes — but the structural differences between them matter a lot in terms of both synthesis and biological activity.
Alkenes are the functional core of most pheromone structures. The position and geometry of the double bond — whether it's Z or E, and where along the carbon chain it sits — determines whether a compound is biologically active or essentially inert to the target insect. Getting this right in production is non-trivial, which is why purity by GC and isomer ratio are the specs buyers should care about most.
Alkynes show up mainly as synthetic intermediates. They're useful because the triple bond is easier to manipulate selectively, allowing chemists to introduce a double bond at a specific position and with defined geometry. You don't usually find alkynes in the final pheromone product, but they're often in the supply chain one step upstream.
Alkanes are the least reactive of the three. In pheromone applications they're sometimes used as carrier solvents or as components of multi-compound blends where a saturated hydrocarbon plays a behavioral role. Some insect species use cuticular hydrocarbons (including long-chain alkanes) as contact recognition signals, though this is more relevant to research applications than commercial lure manufacturing.
Understanding which class a raw material belongs to helps buyers make sense of technical specs and decide whether a supplier's intermediate fits their synthesis route.