‎there is a flatness property of acts over monoids called condition $(pwp)$ which‎, ‎so far‎, ‎has received‎ ‎much attention‎. ‎in this paper‎, ‎we introduce condition gp-$(p)$‎, ‎which is a generalization of condition $(pwp)$‎. ‎firstly‎, ‎some  characterizations of monoids by condition gp-$(p)$ of their‎ ‎(cyclic‎, ‎rees factor) acts are given‎, ‎and many known results are generalized‎. ‎more...

Crystals of the title compound, C(7)H(7)NO(3), under Mo Kα radiation sublime in less than 1h at room temperature. However, it was possible to collect data at 100K. It crystallized as the E isomer only. A double-bond conjugation in the furan ring is extended to the nitro-alkenyl group. Mol-ecular associations were realized in the crystal through N⋯π [3.545 (2) Å] inter-actions involving the fura...

The title Schiff base compound, C(10)H(13)NO(3), obtained by the reaction of 2-hydr-oxy-3-methoxy-benzaldehyde and 2-amino-ethanol in methanol solution, crystallizes in a zwitterionic form, in which the mol-ecule adopts a trans configuration about the central C=N bond. An intra-molecular N-H⋯O hydrogen bond occurs. In the crystal structure, mol-ecules are linked into chains by inter-molecular O...

The mol-ecule of the title compound, C(16)H(17)NO(2), adopts the phenol-imine tautomeric form with a strong intra-molecular O-H⋯N hydrogen bond and an E conformation with respect to the azomethine C=N bond. The dihedral angle between the aromatic rings is 21.23 (9)°. The ethyl group is disordered over two orientations with occupancies of 0.598 (6) and 0.402 (6). In the crystal, the mol-ecules a...

In the title compound, C(8)H(10)N(2)O(3), the hydrazinecarboxyl-ate group is twisted from the furan ring by 6.98 (17)°. In the crystal, the mol-ecules are linked into one-dimensional chains running along the c axis by N-H⋯O hydrogen bonds.

In the title mol-ecule, C(8)H(8)IN(3)O(2), there is an intra-molecular O-H⋯N hydrogen bond between the hy-droxy group and the imine N atom, which generates an S(6) ring. In the crystal, the carbonyl O atom accepts two different N-H⋯O hydrogen bonds, which connect mol-ecules with two R(2) (2)(8) motifs.

In the title compound, C(8)H(6)BrNO(2), the dihedral angle between the planes of the benzene ring and the nitro group is 22.99 (12)°. In the crystal, inversion dimers associated by pairs of short Br⋯O contacts [3.2319 (17) Å] occur.

The title compound, C(14)H(12)ClNO, a Schiff base derived from 3-methyl-salicyl-aldehyde, crystallizes in the phenol-imine tautomeric form with an E conformation for the imine functionality. The mol-ecule is not planar, the dihedral angle between the aromatic rings being 36.38 (5)°. The hy-droxy H atom is involved in a strong intra-molecular O-H⋯N hydrogen bond, generating an S(6) ring.

In the crystal structure of the title compound, C(11)H(11)FO(2), the methine CH forms an intra-molecular hydrogen bond with the carboxyl- O atom. The mol-ecules form dimers through hydrogen bonding between carboxyl- groups. These dimers are linked to each other by C-H⋯O contacts between the benzene and carbonyl groups of adjoining mol-ecules. In addition, there are weak inter-molecular C-H⋯F co...