text: A protecting group or protective group is introduced into a molecule by chemical modification of a functional group to obtain chemoselectivity in a subsequent chemical reaction, facilitating multistep organic synthesis.
  *Boc for the t-butoxycarbonyl group
  *Cbz or Z for the carboxybenzyl group
  *Fmoc for the fluorenylmethoxycarbonyl group
  *Alloc for the allyloxycarbonyl group
  *Troc for the trichloroethoxycarbonyl group
  *TMS, TBDMS, TES, TBDPS, TIPS, ... for various silyl ether groups
  *PMB for the 4-methoxybenzyl group
  *MOM for the methoxymethyl group
  *THP for the 2-tetrahydropyranyl group