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Carboxyl groups can be protected as their 2,4,6-trimethylbenzyl esters by reaction in DMF in the presence of triethylamine. The group can be cleaved by acidolysis (TFA or HBr in AcOH) or hydrogenolysis: Aust. J. Chem., 21, 2831 (1968)./n
Also reported for the protection of thiols (cysteine), stable to refluxing TFA, unlike 4-methoxybenzyl, but cleavable with HF or TfOH-TFA: Coll. Czech. Chem. Commun., 46, 286 (1981), or Ag(I): Chem. Pharm. Bull., 38, 1551 (1990)./n
Gefahrenhinweise (EU): H314-H318
Causes severe skin burns and eye damage. Causes serious eye damage.
Wear protective gloves/protective clothing/eye protection/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF exposed or if you feel unwell: Immediately call a POISON CENTER/doctor