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MASKING OF THE AMINO FUNCTION
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2-amino acid anhydride acid chloride acylamino acid acylated added addition alanine alcohol alkali amide amine amino acid amino acid ester amino acid residues ammonia anhydrous aqueous solution arginine aspartic acid azide azlactone benzene benzyl ester Bergmann Biol carbobenzoxy carbon dioxide Cbzo Chem chloroform cleavage compounds concentrated condensation cooled corresponding coupling crystalline crystallization cystine dioxane dipeptide employed ester derivatives ester hydrochloride ethanol ether ethyl acetate ethyl ester EtOH filtered filtrate Fischer formation glacial acetic acid glutamic acid glycine HOAc hydrochloric acid hydrogen chloride hydrolysis Illustrative procedure intermediate isolated L-glutamic L-L L-L L-L latter leucine melting point MeOH method mixed anhydride mole molecule NaOH ninhydrin optically active peptide derivative peptide ester phosphate phosphorus precipitate preparation pyridine racemization reactant reaction mixture reactive reagent recrystallized removed room temperature salt sodium hydroxide solvent substituent treatment triethylamine tyrosine vacuo washed yield