1-[2-(4-Carboxy­phen­oxy)eth­yl]piperidinium chloride

In the title structure, C₁₄H₂₀NO₃⁺·Cl⁻, as expected, the pipiridine ring adopts a chair conformation and the carboxylic acid group and the benzene ring are essentially coplanar, forming a conjugated system. In the crystal structure, extended chains are formed through N—H...Cl and O—H...Cl hydrogen bonds.

4-[4-(Dimethyl­amino)phen­yl]-1-(phenyl­sulfonyl)­but-3-en-2-one

An E configuration is found about the C=C double bond in the title mol­ecule, C₁₈H₁₉NO₃S. Evidence is found for significant conjugation in the C₆H₄-NMe₂ residue.