Quantification of sophisticated equilibria in the reaction pool and amplifying catalytic cycle of the soai reaction

Ilya D. Gridnev, Andrey Kh Vorobiev

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

The relative abundance of various species in the reaction pool of the Soai autoamplification reaction was estimated by large-scale density functional theory (DFT) computations involving calculations of the thermodynamic parameters in solution. Detailed conformational analysis of the macrocyclic tetrameric species formed by dimerization of the Zn-O-Zn-O square dimers and of their ZnPr 2 i adducts revealed the structural diversification of the homo- and heterochiral species. Homochiral tetramers are exclusively formed in a specific brandyglass conformation with almost orthogonal pyrimidinyl rings that is virtually unaffected by the formation of a ZnPr 2 i adduct. On the other hand, for heterochiral tetramers the stabilities of brandyglass and layer conformations are approximately equal. The three-dimensional (3D) cavity observed in the ZnPr 2 i adduct of the homochiral brandyglass tetramer forms an ideal chiral pocket for the coordination of the aldehyde followed by perfectly enantioselective alkylation yielding monomeric alcoholate of the same handedness as the tetrameric catalyst. Similar cavity in the heterochiral brandyglass tetramer is significantly less spacious. Moreover, the cavity practically disappears upon the coordination of ZnPr 2 i, hence the heterochiral tetramers are excluded from the flow of catalysis that leads to the realization of Frank's scheme for chiral amplification.

Original languageEnglish
Pages (from-to)2137-2149
Number of pages13
JournalACS Catalysis
Volume2
Issue number10
DOIs
Publication statusPublished - 2012 Oct 5

Keywords

  • Autocatalysis
  • DFT computations
  • Soai reaction
  • Solvent effects
  • Zn alcoholates

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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