(2E)-1-(5-Chloro-thio-phen-2-yl)-3-(2,4,5-trimeth-oxy-phen-yl)prop-2-en-1-one.

In the title mol-ecule, C(16)H(15)ClO(4)S, the chloro-thio-phene and trimeth-oxy-phenyl rings make a dihedral angle of 31.12 (5)°. The C=C double bond exhibits an E conformation.

(2E)-1-(5-Chloro-thio-phen-2-yl)-3-(2,3-dimeth-oxy-phen-yl)prop-2-en-1-one.

In the title compound, C(15)H(13)ClO(3)S, the chloro-thio-phene and dimeth-oxy-phenyl groups are linked by a prop-2-en-1-one group. The C=C double bond exhibits an E conformation. The mol-ecule is non-planar, with a dihedral angle of 31.

3-[4-(Dimethyl-amino)phenyl]-1-(3-pyridyl)prop-2-en-1-one.

The pyridyl and aryl rings in the title compound, C(16)H(16)N(2)O, which are located at the ends of the propenone unit, are inclined at an angle of 17.1 (1)° with respect to each other.

3-(3,4-Dimethoxy-phenyl)-1-(3-pyridyl)prop-2-en-1-one monohydrate.

The pyridyl and aryl rings in the title compound, C(16)H(15)NO(3)·H(2)O, which are located at the ends of the propenone unit, are nearly coplanar with this unit [dihedral angles = 3.74 (14) and 5.06 (13)°, respectively]; the rings are inclined at an angle of 6.