摘要:
                                The structures of O-acetyl-N-(5-phenyl-2-pyridyl)-hydroxylamine, C13H12N2O2, (I), and O-acetyl-N-(2-pyridyl)hydroxylamine, C7H8N2O2, (II), have been determined in order to confirm earlier structure assignments based on spectroscopic information. Compound (I) is the probable mutagenic metabolite of the phenylalanine pyrolysis product 2-amino-5-phenyl-pyridine, The crystal structures of (I) and (II) are the first reported for heterocyclic N-acetoxyarylamines, the corresponding homocyclic arylamine derivatives being extremely unstable. In the solid state, both (I) and (II) exist as hydrogen-bended dimers, with the arylamine N atom acting as donor and the pyridine N atom of a neighboring inversion-related molecule as acceptor; the distance between donor and acceptor N atoms is 3.007(2) in (I) and 2.956(2) Angstrom in (II). This orientation of the N-H bond results in the rotation of the acetoxy group out of the plane of the pyridine ring by 22.5(2) in (I) and 27.4(2)degrees in (II).