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Eschenmoser's salt

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Eschenmoser's salt
Eschenmoser's salt
Names
IUPAC name Dimethylmethylideneammonium iodide
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.046.968 Edit this at Wikidata
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/C3H8N.HI/c1-4(2)3;/h1H2,2-3H3;1H/q+1;/p-1Key: VVDUZZGYBOWDSQ-UHFFFAOYSA-M
  • InChI=1/C3H8N.HI/c1-4(2)3;/h1H2,2-3H3;1H/q+1;/p-1Key: VVDUZZGYBOWDSQ-REWHXWOFAW
SMILES
  • C(C)=C.
  • .(=C)(C)C
Properties
Chemical formula C3H8NI
Molar mass 185.01 g/mol
Appearance colorless hygroscopic crystals
Melting point 116 °C (241 °F; 389 K)
Solubility in water decomp.
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). checkY verify (what is  ?) Infobox references
Chemical compound

Eschenmoser's salt, dimethylmethylideneammonium iodide, is a strong dimethylaminomethylating agent, used to prepare derivatives of the type RCH2N(CH3)2. Enolates, enolsilylethers, and even more acidic ketones undergo efficient dimethylaminomethylation. Once prepared, such tertiary amines can be further methylated and then subjected to base-induced elimination to afford methylenated ketones. The salt was first prepared by the group of Albert Eschenmoser after whom the reagent is named.

References

  1. E. F. Kleinman in "Dimethylmethyleneammonium Iodide and Chloride" in Encyclopedia of Reagents for Organic Synthesis (Ed: L. Paquette) 2004, J. Wiley & Sons, New York.
  2. H. Böhme, E. Mundlos, O.-E.Herboth, "Über Darstellung und Eigenschaften alpha-Halogenierter Amine" Chemische Berichte 1957, 90, 2003-2008.
  3. Jakob Schreiber, Hans Maag, Naoto Hashimoto, Albert Eschenmoser (1971). "Dimethyl(methylene)ammonium Iodide". Angewandte Chemie International Edition in English. 10 (5): 330–331. doi:10.1002/anie.197103301.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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