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The Unusual Stability of Homoleptic Di- and Tetravalent Chromium Alkyls

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journal contribution
posted on 03.08.2002 by Carola Schulzke, Dave Enright, Hiroyasu Sugiyama, Guy LeBlanc, Sandro Gambarotta, Glenn P. A. Yap, Laurence K. Thompson, David R. Wilson, Rob Duchateau
Reaction of CrCl3(THF)3 with 3 equiv of R−M [R = Me3CCH2 (a), Me3SiCH2 (b)] afforded either the previously reported tetravalent homoleptic R4Cr (1a, b) [M = MgCl] or the unprecedented divalent and tetranuclear homoleptic [R2Cr]4 (2b) [M = Li]. Both types of compounds display a remarkable chemical inertness toward proton transfer agents but readily react with ethylene.