4-Methoxybenzyl chloride can be used as a reactant: To synthesize 4-methoxybenzyl esters by reacting with cyclic anhydrides. In the mono-alkylation of trans-1,2-diaminocyclohexane. It can also be used as a: Protecting group for amino acids during peptide synthesis using triethylamine as a base. Co-catalyst in the intramolecular carboamination of aminodienes to N-heterocyclesvia benzyl-group transfer.