Geometry and conformation of crystalline forms of β‐naphthoxy‐substituted 2‐thio‐1,3,2‐oxathiaphospholanes and 2‐thio‐1,3,2‐dithiaphospholanes

Abstract

Three compounds (1, 2, and 3) containing 1,3,2-oxathiaphospholane and I ,3,2-dithiaphospholane rings were subjected to structural studies by the X-ray method. Compounds 1 and 3 attain a half-chair conformation, whereas, for compound 2, an envelope conformatioia of the five-membered heterocyclic ring was found in the solid state. For all three compounds, a site occupation of some structural elements in a unit cell was observed.

Handling of Selenomethionines in Macromolecular Refinement

“…Table 1 contains collection of interatomic distances, which involve S or Se atoms, and shows that the distances which involve Se atoms are much longer from the distances which involve S atoms. All examples, which are provided in Table 1, have been selected from author's previous work on X-ray structure determination of small-molecular organic compounds such as phosphoroorganic disulfides and diselenides [35][36][37][38][39][40][41], selenides [42], dithianes, dithiolanes, oxathiaphospholanes, dithiaphospholanes and oxaselenaphospholanes [43][44][45][46][47][48][49][50][51][52][53], phosphoramidothioates [44], phosphoramidoselenoates [54], sulfoxides [55][56][57][58][59] and thiophosphoryl compounds [60]. For full listing of compounds 1-42 included in that comparison, please see supplementary material.…”