A chemical moiety temporarily added to a molecule to prevent a specific reaction from occurring at a particular functional group during a chemical transformation.
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Benzene, [[2-(phenylsulfonyl)ethyl]thio]-
P-TOLYL ACETATE
dimethyl(octyl)[(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)methyl]silane
