Preparation of active zinc by reduction of zinc chloride with sodium in liquid ammonia and its use in the barbier reaction
作者:Mieczysław Mąkosza、Karol Grela
DOI:10.1016/0040-4039(95)01948-h
日期:1995.12
Active zine powder produced by reduction of anhydrous zine chloride with solution of sodium in liquidammonia exhibits high reactivity in the Barbier type reaction both in THF and liquidammonia solution.
Homoallylic alcohols from samarium diiodide-mediated coupling of allylic sulfones with carbonyl compounds
作者:Jonathan Clayden、Marc Julia
DOI:10.1039/c39940002261
日期:——
Reduction of allylic sulfones with samarium diiodide gives allylsamarium species which react in situ with carbonyl compounds, yielding homoallylic alcohols.
Preparation and reactions of samarium diiodide in nitriles
作者:Béatrice Hamann、Jean-Louis Namy、Henri B. Kagan
DOI:10.1016/0040-4020(96)00861-7
日期:1996.11
Samarium diiodide can be prepared from samarium metal in various nitriles. Because of its chemical inertness pivalonitrile is the most suitable solvent. Organic reactions mediated by SmI2 are slower than in THF, but selectivities are often improved. Reactions are greatly accelerated by addition of catalytic amounts of some transition metal salts.
Allylic phosphates allylate ketones and aldehydes in the presence of samarium(II) iodide. The coupling proceeds with the preservation of the olefin geometry, however, regio- and stereoselectivity are not high.