Crystal structure of a new spiro-polytetrahydrofuran compound with translational pseudosymmetry: rac-(2S,2′S,5′R)-2-methyl-5′-[(1R,2R,5S,5′R)-1,4,4,5′-tetramethyldihydro-3′H-3,8-dioxaspiro[bicyclo[3.2.1]octane-2,2′-furan]-5′-yl]hexahydro[2,2′-bifuran]-5(2H)-one

Acta Crystallographica Section E: Crystallographic Communications

Vincenzo Piccialli¹  Roberto Centore¹  Angela Tuzi¹ 

[1] Dipartimento di Scienze Chimiche, Università degli Studi di Napoli `Federico II', Complesso di Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy;

关键词: crystal structure;    pseudosymmetry;    pseudotranslation;    poly-THF compounds;    spiro-compounds;   

DOI  :  10.1107/S2056989017006065

来源: DOAJ

【 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.

【 授权许可】

Unknown