1-Adamantyl fluoroformate was prepared from 1-adamantol and fluorophosgene. The cristalline and stable fluoroformate was allowed to react with amino acids to give the corresponding 1-adamantyloxycarbonyl derivatives in consistently high yields. Additonally this new reagent proved to be ideally reactive for acylation of the imidazol function of histidine and histidyl-peptides.