The title compound, C(19)H(20)O(5), is approximately planar; the dihedral angle between the benzene rings is 3.82 (8)°, and the central propenone C(=O)-C=C plane makes dihedral angles of 1.95 (10) and 3.17 (11)° with the two benzene rings. In the crystal structure, intra- and inter-molecular C-H⋯O hydrogen bonds are observed.

The reaction of 5,6-(2,2-dimethyl-chromane)-2-hy-droxy-4-meth-oxy-acetophenone and 3,4-methlene-dioxy-benzaldehyde affords the title chalcone derivative, C(22)H(22)O(6). The two benzene rings are connected through a -C(=O)-CH=CH- (propenone) unit, which is in an E conformation; the ring with the hy-droxy substitutent is aligned at 6.2 (1)° with respect to this unit, whereas the ring with the me...

Protonated cyclic dipeptides undergo collision-induced dissociation, and this reaction mechanism strongly depends on the symmetry nature of residues. We review main dissociation for a series dipeptides, obtained through chemical dynamics simulations. The systems range from symmetrical cyclo-(glycyl-glycyl), with two possible protonation sites located peptide ring, to cyclo-(tyrosyl-prolyl), whe...

Bacillus amyloliquefaciens Q-426 with strong antifungal activity was isolated from the compost samples in Dalian of China. Four kinds diketopiperazines were extracted strain including cyclo(Pro-Phe) (cPP), which had cyclo(L-Pro-L-Phe), cyclo(D-Phe-L-Pro), cyclo(D-Pro-D-Phe) and cyclo(L-Pro-D-Phe) isomers. Results showed that (1) cPP production reached maximum at 12 h then maintained constant yi...

Chemical investigations of Aquimarina sp. MC085, which suppressed TGF-?-induced epithelial–mesenchymal transition (EMT) in A549 human lung cancer cells, led to the isolation compounds 1–3. Structural characterization using spectroscopic data analyses combination with Marfey’s analysis revealed that they were two diketopiperazines [cyclo(l-Pro-l-Leu) (1) and cyclo(l-Pro-l-Ile) (2)] one N-pheneth...

The title compound, C(17)H(14)F(2)O(3), is approximately planar, the dihedral angle between the rings being 5.46 (2)°. The H atoms of the central propenone group are trans. The crystal structure is stabilized by inter-molecular C-H⋯F hydrogen bonds.

The title compound, C(16)H(13)ClO, adopts an E configuration with respect to the C=C double bond of the propenone unit. The dihedral angle between the two benzene rings is 45.9 (2)°. In the crystal structure, mol-ecules are arranged into sheets parallel to the ac plane and the sheets are stacked along the b axis. This arrangement is stabilized by weak inter-molecular C-H⋯π inter-actions involvi...

The piperidine ring in the title compound, C(21)H(23)NO(2), is in a slightly distorted chair conformation. The dihedral angle between the two benzene rings is 5.6 (4)°. The dihedral angles between the propenone unit and the benzene and meth-oxy-substituted benzene rings are 5.6 (7) and 10.7 (8)°, respectively. Weak inter-molecular C-H⋯O hydrogen bonds and weak C-H⋯π inter-actions contribute to ...

The title compound, C(16)H(13)BrO, was synthesized from the reaction of 3-bromo-benzaldehyde and 4-methyl-acetophenone in the presence of KOH. The mol-ecule adopts an E configuration with respect to the C=C double bond of the propenone unit. The dihedral angle formed by the aromatic rings is 46.91 (14)°. The crystal structure is stabilized by Br⋯Br inter-actions [3.4549 (11) Å].

The title compound, C(15)H(10)Cl(2)O, adopts an E configuration with respect to the C=C bond of the propenone unit. The dihedral angle between the two benzene rings is 32.4 (1)°. Intra-molecular C-H⋯O and C-H⋯Cl hydrogen bonds generate an S(5)S(5)S(5) motif. In addition, the crystal structure is stabilized by weak inter-molecular C-H⋯O hydrogen bonds.