Schulzke, Carola Enright, Dave Sugiyama, Hiroyasu LeBlanc, Guy Gambarotta, Sandro P. A. Yap, Glenn Thompson, Laurence K. Wilson, David R. Duchateau, Rob The Unusual Stability of Homoleptic Di- and Tetravalent Chromium Alkyls Reaction of CrCl<sub>3</sub>(THF)<sub>3</sub> with 3 equiv of R−M [R = Me<sub>3</sub>CCH<sub>2</sub> (<b>a</b>), Me<sub>3</sub>SiCH<sub>2</sub> (<b>b</b>)] afforded either the previously reported tetravalent homoleptic R<sub>4</sub>Cr (<b>1a</b>,<b> b</b>) [M = MgCl] or the unprecedented divalent and tetranuclear homoleptic [R<sub>2</sub>Cr]<sub>4</sub> (<b>2b</b>) [M = Li]. Both types of compounds display a remarkable chemical inertness toward proton transfer agents but readily react with ethylene. tetranuclear homoleptic;Li;divalent;ethylene;MgCl;tetravalent homoleptic R 4 Cr;proton transfer agents;chemical inertness;CrCl 3;type;R 2 Cr;3 SiCH 2;3 CCH 2;Tetravalent Chromium Alkyls Reaction;THF;compounds display;2 b;Unusual Stability;Homoleptic Di;3 equiv 2002-08-03
    https://acs.figshare.com/articles/journal_contribution/The_Unusual_Stability_of_Homoleptic_Di-_and_Tetravalent_Chromium_Alkyls/3772476
10.1021/om020237z.s002