Crystal and molecular structure of β-piperidinopropioamidoxime monochloroacetate and hydrochlorides of its O-benzoylation products

The structures of β-piperidinopropioamidoxime monochloroacetate and O-benzoyl- and O-para-toluyl-β-piperidinopropioamidoxime hydrochlorides have been determined. The geometry of these compounds is analyzed. The N-O bond is in the syn-planar position in β-piperidinopropioamidoxime monochloroacetate, but adopts an anti-orientation relative to the C(2)-C(3) bond of the propioamidoxime fragment in the other two compounds. In β-piperidinopropioamidoxime monochloroacetate crystals, the cation-anion pairs are joined by intermolecular hydrogen bonds into chains; the latter are linked by van der Waals contacts. The crystals of the O-benzoyl- and O-para-toluyl-β-piperidinopropioamidoxime hydrochlorides are characterized by the same system of hydrogen bonds; the cations and anions are linked by hydrogen bonds into layers, and the latter make van der Waals contacts in the structure.