Synthesis and reactivity of benzylic and allylic samarium compounds
作者:C. Bied、J. Collin、H.B. Kagan
DOI:10.1016/s0040-4020(01)88468-4
日期:1992.1
Benzyl and allyl samarium species are prepared by reaction of benzylic or allylicchlorides with SmCp2. They present a wide scope of reactivity towards aldehydes, ketones and acid chlorides.
Coupling reactions of α-chloroesters with aryl halides (α-arylation) or carbonyl compounds (Reformatsky) using nickel catalyst allow, under mild conditions, the preparation of various functionalized aryl propionic acid derivatives or β-hydroxyesters. In the synthesis of aryl propionic acid derivatives, the process is efficient with aryl halides bearing either electron-withdrawing or electron-donating
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.
synthesized from aldehydes or ketones and allylicacetates, using an electrochemical process catalyzed by iron complexes. We first studied the reactivity of allyl acetate, using N,N-dimethylformamide (DMF) or acetonitrile (AN) as solvent, FeBr(2) as catalyst, and Fe as the sacrificial anode. Then we tested the regioreactivity of crotyl acetate and other allylic derivatives.