Substrate
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1. The species bearing the ligand replaced by the nucleophile in a nucleophilic substitution is called the substrate.
eg. 1:
eg. 2:
2. The species bearing the ligand that leaves the species with a H+ in a 1,1-elimination or in a 1,2-elimination is called the substrate.
eg. 1:
eg. 2:
see also leaving group