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.
Matthew D. Cullen, William C. Ho, Joseph D. Bauman, Kalyan Das, Eddy Arnold, Tracy L. Hartman, Karen Watson, Robert W. Buckheit, Christophe Pannecouque, De Clercq Erik, Mark Cushman
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