An organic compound with seven carbon atoms containing one double bond between two of the carbons, used in synthesis and fuel research.
From 'heptyl-' (seven carbons) plus '-ene', the suffix indicating a double bond. Emerged in late 19th-century organic chemistry.
The difference between heptane (saturated) and heptylene (unsaturated) is a single double bond—but that tiny change makes one inactive and the other extremely reactive, showing how one pair of electrons can transform a molecule's personality.
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