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 newroute to organolanthanoid compounds. It also
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.
Organosamariums: preparation using diiodosamarium and reactivity in tetrahydropyran
作者:Béatrice Hamann-Gaudinet、Jean-Louis Namy、Henri B. Kagan
DOI:10.1016/s0022-328x(98)00666-4
日期:1998.9
Diiodosamarium prepared in tetrahydropyran reduces allylic, benzylic and alkyl halides at 0 or -15 degrees C to give organosamariums which are stable under these conditions. The reactivity of these organometallics has been explored, showing that they are very selective reagents. (C) 1998 Elsevier Science S.A. All rights reserved.
Generation and reactivity of allylic and benzylic samarium compounds using diiodosamarium in tetrahydropyran
作者:Béatrice Hamann-Gaudinet、Jean-Louis Namy、Henri B. Kagan
DOI:10.1016/s0040-4039(97)01506-2
日期:1997.9
Diiodosamarium prepared in THP reduces allylic iodides and bromides at 0 or -15 degrees C to give organosamarium compounds which are stable under these conditions. These allylic samarium compounds react with many functionalities including the keto group of keto esters. Benzylic samarium compounds were prepared similarly from benzylic bromides. (C) 1997 Elsevier Science Ltd.
NOKAMI, JUNZO;OGAWA, HIDEKI;MIYAMOTO, SHINYA;MANDAI, TADAKATSU;WAKABAYASH+, TETRAHEDRON LETT., 29,(1988) N 40, C. 5181-5184