They each have the same molecular formula and carbon framework, but they differ in the position of carbon-carbon double bonds.

α-Terpinene has been isolated from cardamom and marjoram oils, and from other natural sources.

γ-Terpinene and δ-terpinene (also known as terpinolene) have been isolated from a variety of plant sources.

It has perfume and flavoring properties but is mainly used to confer pleasant odor to industrial fluids.

LPP then forms a resonance-stabilized cation by loss of the pyrophosphate group.