Ethyl 4-(phenyl­sulfon­yl)piperazine-1-carboxyl­ate

In the title compound, C13H18N2O4S, the piperazine ring adopts a chair conformation. The dihedral angle between the least-squares planes through the piperazine and benzene rings is 73.23 (10)°. In the crystal, there are no classical hydrogen bonds but stabilization is provided by weak C—H⋯π inter­actions

Naphthalen-1-aminium chloride

In the crystal structure of the title compound, C10H10N+·Cl−, the two components are connected via N—H⋯Cl hydrogen bonds, forming a layer parallel to the bc plane

(2,6-Difluoro­phen­yl)(4-methyl­piperidin-1-yl)methanone

In the title compound, C13H15F2NO, the piperidine ring adopts a chair conformation. The dihedral angle between the least-squares plane of the piperidine ring and the benzene ring is 48.75 (7)°. In the crystal structure, the mol­ecules are connected via C—H⋯O hydrogen bonds, forming a zigzag chain along the b axis