Stereochirotopolysis nonrotative

Figure 18.8 portrays transformations 36-39, which exemplify cases sp nonrotative stereochirotopolyses (Class 2A) transformations 40-42 represent instances of the sp variety. The Ao, As, Ac numbers, given for these transformations, refer to the overall transformations in the case of transformation 38, the values apply to each one of the four isomeric products. Finally, in Figure 18.9 (p. 114), we present transformations 41-45 as examples of sp rotative stereochirotopolysis (Class 2B), and 46-49, as representative rotative sp stereochirostopolyses (Class 2B). 

Homotopic faces hi-h4 do not undergo any chirotopolysis (Classes 1A-2B). In contrast, h5 faces are subject to nonrotative astereochirotopolysis (Class lA) (chiral reagents), and h6 faces, to nonrotative stereochirotopolysis (Class 2A) (chiral reagents). 

Only rotative astereochirotopolysis (Class IB) and nonrotative stereochirotopolysis (Class 2A) are possible the former occurs with chiral reagents, and the latter, with achiral reagents. 

No chirotopolysis is expected for di faces. Nonrotative astereochirotopolysis (Class lA) is expected for d2 faces (achiral reagents) the nonrotative and rotative modes (Classes 1A and IB) are discerned only for d4 faces (chiral reagents). Nonrotative stereochirotopolysis (Class 2A) is indicated only for d3 (achiral reagents) and d4 faces (achiral or chiral reagents) the rotative mode is possible for d3 (achiral reagents) as well as d4 (chiral reagents) faces. 

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