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1997
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Research: Science and Education
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The Onium Compounds
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Nicolay V. Tsarevsky, Vera Slaveykova, Stefan Manev, and Dobri Lazarov
University of Sofia, Faculty of Chemistry, Department of Inorganic Chemistry, 1 James Bourchir Blvd., 1126 Sofia, Bulgaria
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June 1997
Vol. 74 No. 6
p. 734
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| Abstract |
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The onium salts are of a big interest for theoretical and structural chemistry, and for organic synthesis. Some representatives of the group (e.g. ammonium salts) were known from the oldest times. Many onium salts are met the nature: ammonium salts (either as inorganic salts, and organic derivatives, e.g. aminoacids, salts of biogenic amines and alkaloids, etc.); oxonium salts (plant pigments as anthocyans are organic oxonium compounds), etc. In 1894 C. Hartmann and V. Meyer prepared the first iodonium salts - 4-iododiphenyliodonium hydrogensulfate and diphenyliodonium salts, and suggested the ending -onium for all compounds with properties similar to those of ammonium salts. Nowadays onium compounds of almost all nonmetals are synthesised and studied.
A great variety of physical methods: diffraction (e.g. XRD) and spectral methods (IR-, NMR-, and UV-spectra), as well as the chemical properties and methods of preparation of onium salts have been used in determination of the structure of these compounds.
The application of different onium salts is immense. Ammonium, phosphonium and sulfonium salts are used as phase-transfer catalysts; diazonium salts - for the preparation of dyes, metalochromic and pH-indicators. All the onium salts and especially diazonium and iodonium salts are very useful reagents in organic synthesis.
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| More Information |
 Citation |
Tsarevsky, Nicolay V.; Slaveykova, Vera; Manev, Stefan; Lazaroz, Dobri. J. Chem. Educ. 1997 74 734.
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Keywords |
Phase Transitions/Diagrams, Organic Chemistry, Atomic Properties/Structure
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History |
Created:
Last Updated: |
July 28, 1999
June 23, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
1997
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June
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734
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