Crystal structure of bis-p-anizidinegossypol with an unknown solvate.

The title compound, C44H44N2O8, (systematic name: 1,1',6,6'-tetra-hydroxy-5,5'-diisopropyl-8,8'-bis-{[(4-meth-oxy-phen-yl)iminium-yl]meth-yl}-3,3'-dimethyl-2,2'-bi-naphthalene-7,7'-diolate) has been obtained by the addition of p-anizidine to gossypol dissolved in di-chloro-methane. In the solid state, the title compound exists in the enamine or quinoid form. The two naphthyl moieties are inclined to one another by 72.

Redetermined structure of gossypol (P3 polymorph).

An improved crystal structure of the title compound, C30H30O8 (systematic name: 1,1',6,6',7,7'-hexa-hydroxy-5,5'-diisopropyl-3,3'-dimeth-yl[2,2'-bi-naphthalene]-8,8'-dicarbaldehyde), was determined based on modern CCD data. Compared to the previous structure [Talipov et al. (1985).

Mol-ecular and crystal structure of gossypol tetra-methyl ether with an unknown solvate.

The title compound, C34H38O8 (systematic name: 5,5'-diisopropyl-2,2',3,3'-tetra-meth-oxy-7,7'-dimethyl-2H,2'H-8,8'-bi-[naphtho-[1,8-bc]furan]-4,4'-diol), has been obtained from a gossypol solution in a mixture of dimethyl sulfate and methanol. The mol-ecule is situated on a twofold rotation axis, so the asymmetric unit contains one half-mol-ecule. In the mol-ecule, the hy-droxy groups are involved in intra-molecular O-H⋯O hydrogen bonds, and the two naphthyl fragments are inclined each to other by 83.