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

Piccialli, V.¹  Tuzi, A.¹  Centore, R.¹ 

[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

学科分类：数学（综合）

来源: International Union of Crystallography

【 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】

CC BY