title: Refinement of obverse/reverse twins.
abstract: Two examples of structures of obverse/reverse twins are presented. Example (1) is the structure of 2,2,4,4,6,6-hexa-tert-butylcyclotrisiloxane. It crystallizes in R3 macro c. Example (2) is the structure of [[Li(Me(3)Si)(3)CAlF(3)(thf)](3)LiF(thf)], tris[lithium tetrahydrofuran (trimethylsilyl)methyltrifluoroaluminate]lithium fluoride tetrahydrofuran. It crystallizes in R3. Additional to the obverse/reverse twinning this structure shows merohedral twinning. It will be shown how these two structures can be refined with the SHELXL program.
authors.affiliation: Department of Structural Chemistry, University of Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany. rherbst@shelx.uni-ac.gwdg.de
authors.forename: Regine
authors.initials: R
authors.lastname: Herbst-Irmer
authors.forename: George M
authors.initials: GM
authors.lastname: Sheldrick