Lewis acid



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A Lewis acid (LA) can accept a pair of Brønsted-Lowry acid.

An ion (H+), a Lewis acid can be any electrophile (including H+). Although all Brønsted-Lowry acids are Lewis acids, in common usage the term Lewis acid is often reserved for those Lewis acids which are not Brønsted-Lowry acids.

The reactivity of Lewis acids can be judged from the solution suffers from the same restriction.[2]

Some common Lewis acids include niobium pentachloride and the lanthanide triflates such as ytterbium(III) triflate.

Lewis acids may be corrosive. hydrogen chloride and metal oxychloride.

Ate complexes

An ate complex is a Georg Wittig in 1958 [4]. Similarly Lewis bases form onium salts.

References

  1. ^ Christe, K.O.; Dixon, D.A.; McLemore, D.; Wilson, W.W.; Sheehy, J.A.; and Boatz, J.A. (2000). "On a quantitative scale for Lewis acidity and recent progress in polynitrogen chemistry". Journal of Fluorine Chemistry 101 (2): 101, 151-153. ISSN 0022-1139.
  2. ^ Discussions involving Christe and Dixon mentioned in reference 1 at the American Chemical Society 16th Winter Fluorine Conference, St. Pete Beach, Florida, January 12–17, 2003.
  3. ^ Advanced organic Chemistry, Reactions, mechanisms and structure 3ed. Jerry March ISBN 0-471-85472-7
  4. ^ Komplexbildung und Reaktivität in der metallorganischen Chemie Angewandte Chemie Volume 70, Issue 3, Date: 7 Februar 1958, Pages: 65-71 G. Wittig doi:10.1002/ange.1760700302

Further reading

  • The Lewis acid-base concepts : an overview, 1980, ISBN 0471039020
  • Selectivities in Lewis acid promoted reactions, 1989, ISBN 0792304527
  • Lewis acid reagents : a practical approach, 1999, ISBN 0198500998

See also

 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Lewis_acid". A list of authors is available in Wikipedia.