Structural comparison of three N-(4-halogenophenyl)-N'-[1-(2-pyridyl)ethylidene]hydrazine hydrochlorides.

2-{1-[(4-Chloroanilino)methylidene]ethyl}pyridinium chloride methanol solvate, C(13)H(13)ClN(3)(+) x Cl(-) x CH(3)OH, (I), crystallizes as discrete cations and anions, with one molecule of methanol as solvent in the asymmetric unit. The N-C-C-N torsion angle in the cation indicates a cis conformation. The cations are located parallel to the (\overline{2}02) plane and are connected through hydrogen bonds by a methanol solvent molecule and a chloride anion, forming zigzag chains in the direction of the b axis.

4-(3-Methoxy-phen-oxy)butyric acid.

In the title compound, C(11)H(14)O(4), an inter-mediate for the synthesis of a new kind of estrogen receptor modulator, all non-H atoms lie on a common plane (r.m.s.