Crystal structure of a new spiro-polytetra­hydro­furan compound with translational pseudosymmetry: rac-(2S2′S5′R)-2-methyl-5′-(1R2R5S5′R)-1445′-tetra­methyl­dihydro-3′H-38-dioxa­spirobi­cyclo­3.2.1octane-22′-furan-5′-ylhexa­hydro22′-bi­furan-5(2H)-one

摘要

The title compound, C22H34O6, is a product of oxidation of squalene with the catalytic system RuO4(cat.)/NaIO4. The asymmetric unit contains two crystallographically independent mol­ecules of very similar geometry approximately related by the non-crystallographic translation vector >c/2. As a consequence, the average diffracted intensity in the hkl layers with odd l is systematically lower than in the layers with even l. In one mol­ecule, the lactone ring and part of the adjacent tetra­hydro­furan ring are disordered over two orientations with refined occupancy ratio of 0.831 (10):0.169 (10). The crystal structure is mainly governed by van der Waals forces.