Step-by-step explanation:
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In the biosynthesis process of compounds of great importance, the first step for dimethylalkyl pyrophosphate is the nucleophilic substitution.
In the nucleophilic substitution, it happens that a nucleophilic group, which has electrons, replaces another group called electrophilic which lacks electrons.
Consequently, the nucleophilic group replaces the electrophilic group.