4a-hydroxy-3,3,6,6-tetra-methyl-9-[6-(3,3,6,6-tetra-methyl-1,8-dioxo-2,3,4, 5,6,7,8,9-octa-hydro-1H-xanthen-9-yl)pyridin-2-yl]-2,3,4,4a,5,6,7,8,9, 9a-deca-hydro-1H-xanthene-1,8-dione ethanol hemisolvate hemihydrate

Mohamed S. K., Abdelhamid A. A., Xəlilov Ə., Gurbanov A. V., Ng S. W.

Acta Crystallographica Section E: Structure Reports Online, vol.67, no.4, 2011 (SCI-Expanded) identifier identifier

Qısa məlumat

The pyridine ring in the title compound, C39H 47NO7·0.5C2H5OH·0.5 H2O, is connected to one 3,3,6,6-tetra-methyl-1,8-dioxoxanthenyl and one 4a-hydroxy-3,3,6,6-tetra-methyl-1,8-dioxodeca-hydroxanthenyl substituent in the 2- and 6-positions of the ring. In the former substituent, the six-membered xanthenyl ring adopts a flattened envelope conformation (with the methine C atom as the flap) while in the latter, the six-membered xanthenyl ring adopts a twisted envelope conformation (with the C atom bearing the hydroxy group representing the flap). The hydroxy H atom forms an intra-molecular hydrogen bond to the pyridyl N atom. An ethanol solvent molecule is disordered with respect to a water molecule in a 1:1 ratio. The water molecule itself is disordered over two positions of equal occupancy.