Pentafluoro-D-Phenylalanine is a non-proteinogenic, fluorinated amino acid derivative in which the phenylalanine side chain bears five fluorine atoms on the aromatic ring, and the α-carbon is specified as the D stereoisomer. The molecule contains a free amino group and a carboxyl group alongside a pentafluorophenyl side chain whose electron-withdrawing fluorination alters aromatic reactivity and hydrophobic/π-interaction characteristics relative to unfluorinated phenylalanine. It is employed in chemical biology and peptide-chemistry workflows for structure-activity studies, incorporation of fluorinated aromatic residues into peptide analogues, and analytical method development where fluorinated aromatic handles can support spectroscopic or chromatographic differentiation.
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