(E)-4-Meth-oxy-N'-(2,4,5-tri-meth-oxy-benzyl-idene)benzohydrazide hemihydrate.

The title compound crystallizes as a hemihydrate, C18H20N2O5·0.5H2O. The mol-ecule exists in an E conformation with respect to the C=N imine bond.

(E)-N'-(4-Eth-oxy-benzyl-idene)-4-hy-droxy-benzohydrazide dihydrate.

The benzohydrazide mol-ecule of the title compound, C(16)H(16)N(2)O(3)·2H(2)O, exists in a trans conformation with respect to the C=N double bond. The central O=C-NH-N=C plane [r.m.

(E)-4-Bromo-N'-(4-hy-droxy-3-meth-oxy-benzyl-idene)benzohydrazide monohydrate.

In the title compound, C(15)H(13)BrN(2)O(3)·H(2)O, the dihedral angle between the two benzene rings is 13.92 (6)°. The meth-oxy group of the 4-hy-droxy-3-meth-oxy-phenyl is almost coplanar with its bound benzene ring, as seen by the C(meth-yl)-O-C-C torsion angle of -0.

(E)-N'-(3-Eth-oxy-4-hy-droxy-benzyl-idene)-4-meth-oxy-benzohydrazide.

In the mol-ecule of the title benzohydrazide derivative, C(17)H(18)N(2)O(4), the dihedral angle between the benzene rings is 6.86 (11)°. The meth-oxy group of the 4-meth-oxy-phenyl fragment deviates slightly [C(methyl)-O-C-C = 10.

(E)-4-Meth-oxy-N'-(3,4,5-trimeth-oxy-benzyl-idene)benzohydrazide.

In the asymmetric unit of the title compound, C(18)H(20)N(2)O(5), there are two crystallographic independent mol-ecules. Both mol-ecules are twisted; the dihedral angle between the two benzene rings is 7.2 (5)° in one mol-ecule, whereas it is 85.

(E)-4-Hy-droxy-N'-(3,4,5-trimeth-oxy-benzyl-idene)benzohydrazide.

The title benzohydrazide derivative, C(17)H(18)N(2)O(5), exists in a trans conformation with respect to the C=N double bond. The dihedral angle between the benzene rings is 19.41 (5)°.

(E)-N'-(3-Hy-droxy-4-meth-oxy-benzyl-idene)-4-meth-oxy-benzohydrazide.

The title mol-ecule, a benzohydrazide derivative, C(16)H(16)N(2)O(4), is twisted with a dihedral angle of 69.97 (5)° between the two benzene rings. An intra-molecular O-H⋯O hydrogen bond generates an S(5) ring motif.

(E)-N'-(2,3-Dihy-droxy-benzyl-idene)-4-meth-oxy-benzohydrazide.

The mol-ecule of the title benzohydrazide derivative, C(15)H(14)N(2)O(4), is twisted and exists in a trans conformation with respect to the C=N double bond. The dihedral angle between the benzene rings is 56.86 (9)° and the C atom of the meth-oxy group deviates slightly [C-O-C-C = -10.

(E)-4-Hy-droxy-N'-(3-hy-droxy-4-meth-oxy-benzyl-idene)benzohydrazide.

The mol-ecule of the title benzohydrazide derivative, C(15)H(14)N(2)O(4), exists in a trans conformation with respect to the C=N double bond and is twisted, the dihedral angle between the two benzene rings being 24.17 (6)°. The meth-oxy group is almost co-planar with respect to the attached benzene ring [C(m)-O-C-C (m = meth-yl) = -1.

(E)-3-(4-Eth-oxy-phen-yl)-1-(2-hy-droxy-phen-yl)prop-2-en-1-one.

In the title compound, C(17)H(16)O(3), the carbonyl group is in an s-cis configuration with respect to the olefinic double bond. The dihedral angle between the two benzene rings is 2.85 (3)°.

(E)-3-(Anthracen-9-yl)-1-(furan-2-yl)prop-2-en-1-one.

In the mol-ecule of the title heteroaryl chalcone derivative, C(21)H(14)O(2), the almost planar prop-2-en-1-one unit [r.m.s.

(Z)-3-(9-Anthr-yl)-1-(4-methoxy-phen-yl)prop-2-en-1-one.

The title chalcone derivative, C(24)H(18)O(2), which consists of the substituted 4-methoxy-phenyl and anthracene rings bridged by the prop-2-en-1-one unit, exists in a cis configuration. The mol-ecule is twisted, the inter-planar angle between the benzene and anthracene rings being 69.50 (10)°.