Barbier/Grignard-Type Allylation or Benzylation Mediated by the Mischmetall/SmI2(cat.) System
Résumé
Barbier- and Grignard-type allylation and benzylation have been achieved by the use of samarium diiodide in catalytic amounts together with mischmetall (an alloy of the light lanthanides) as a coreductant. Plausible catalytic schemes are proposed. In addition, organocerium and -lanthanum reagents have been obtained from samarium diiodide catalysed reactions between organic halides and cerium or lanthanum metal, giving a new route to organolanthanoid compounds. It also appears that trivalent benzyl and allyl organometallic compounds of cerium and lanthanum are much more stable than the corresponding samarium ones.
Fichier principal
B. Eur. J. Org. Chem. 2002, 2989-2995 Allyl benzyl barbier grignard SmI2.pdf (835.22 Ko)
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