Molecular dynamics of 6-methyl-2-phenyl-2,3-dihydro-4H-chromen-4-one and 6-methyl-2-(4-nitrophenyl)-2,3-dihydro-4H-chromen-4-one (flavanone) derivatives in a solution studied by NMR spectroscopy.

Molecular dynamics of benzoxazepin, oxime, pyrazole, and thiosemicarbazone derivatives of some flavanones have been investigated in a solution using NMR. The results confirm the formation of different O-H···O, O-H···N, N···H-N type intramolecular hydrogen bonds in the pyrazole and oxime molecules. The rotational barrier energy and energy of intramolecular hydrogen bonds have been determined.

1,10-Bis[2-(prop-1-en-yl)phen-oxy]deca-ne.

The complete molecule of the title compound, C(28)H(38)O(2), is generated by a crystallographic centre of symmetry. The molecular conformation displays an intra-molecular C-H⋯π inter-action.

1,4-Bis[2-(prop-1-en-yl)phen-oxy]butane.

The mol-ecule of the title compound, C(22)H(26)O(2), exhibits C(i) mol-ecular symmetry with a crystallographic inversion centre at the mid-point of the central C-C bond. A kink in the mol-ecule is defined by the torsion angle of 66.7 (2)° about this central bond of the alkyl bridge.

Molecular dynamics of cis-1-(2-hydroxy-5- methylphenyl)ethanone oxime and N-(2-hydroxy-4-methylphenyl)acetamide in solution studied by NMR spectroscopy.

The formation of hydrogen bonds and molecular dynamics for the molecules cis-1-(2-hydroxy-5-methylphenyl)ethanone oxime (I) and N-(2-hydroxy-4-methylphenyl)acetamide (II) have been investigated in solution using NMR. The results confirm the formation of O-H..