Monoterpenoids geranyl carbocation

The further conversion of geranyl diphosphate into monoterpenoids typically involves carbocation intermediates and multistep reaction pathways that are catalyzed by terpene cyclases. Monoterpene cyclases function by first isom-erizing geranyl diphosphate to its allylic isomer linalyl diphosphate (LPP), a process that occurs by spontaneous S>jl-like dissociation to an allylic carbocation, followed by recombination. The effect of this isomerization is to convert the C2-C3 double bond of GPP into a single bond, thereby making cyclization possible and allowing EjZ isomerization of the double bond. 

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