Lewis Base-Catalyzed, Lewis Acid-Mediated Reactions (n → σ*)

Sergio Rossi, Scott E. Denmark

Research output: Chapter in Book/Report/Conference proceedingChapter


The tremendous growth of interest in silicon chemistry was initially related to the ability of silicon to break the 'Lewis-Langmuir octet rule'. The chemistry of chiral, hypercoordinate silicon species has attracted increasing attention because of the capability of these compounds to catalyze a variety of stereoselective reactions. This chapter focuses on the interaction between the nonbonding electron pairs of the Lewis base (LB) donor and the o-antibonding orbitals of the silicon-based Lewis acid. When a silicon-based Lewis acid is involved in the formation of an acid-base adduct, a redistribution of the density over the peripheral ligands takes place. Such 'redistribution' results in bond lengthening as the coordination number of the Lewis acid increases with the expansion of the coordination sphere. The scope of Lewis base-catalyzed, Lewis acid-mediated reactions was expanded in 2003 to include stereoselective aldol additions of silyl enol ethers of achiral methyl ketones to aldehydes promoted by SiCl4 and catalyzed by phosphoramides.

Original languageEnglish (US)
Title of host publicationLewis Base Catalysis in Organic Synthesis
PublisherWiley-VCH Verlag
Number of pages38
ISBN (Electronic)9783527675142
ISBN (Print)9783527336180
StatePublished - Aug 17 2016


  • Aldol reaction
  • Allylation reaction
  • Bisphosphoramide
  • Bisvinylogous aldol addition
  • Catalysis
  • Diastereoselectivity
  • Donor-acceptor interactions
  • Double aldol reaction
  • Electrophilic
  • Enantioselectivity
  • Glycolate aldol reaction
  • Hexacoordinate silicon
  • Hypercoordinate silicon
  • Hypervinylogous aldol reaction
  • Isocyanide
  • Lewis base
  • Passerini reaction
  • Pentacoordinate silicon
  • Phosphine oxides
  • Phosphoramides
  • Pinwheel conformation
  • Silicenium ions
  • Silyl enol ethers
  • Silyl ketene acetals
  • Silyl ketene imines
  • Silyl vinylketene imines
  • Stereoselective
  • Synthetic methods
  • Trichlorosilyl enol ethers
  • Trigonal bipyramidal silicon
  • Vinylogous aldol reaction
  • α-hydroxy amides
  • α-hydroxy esters

ASJC Scopus subject areas

  • Chemistry(all)

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  • Cite this

    Rossi, S., & Denmark, S. E. (2016). Lewis Base-Catalyzed, Lewis Acid-Mediated Reactions (n → σ*). In Lewis Base Catalysis in Organic Synthesis (Vol. 3, pp. 1039-1076). Wiley-VCH Verlag. https://doi.org/10.1002/9783527675142.ch21