Reactivity Consequences of Steric Reduction in Cyclopentadienyl Chromium β-Diketiminate Complexes
作者:K. Cory MacLeod、Julia L. Conway、Liming Tang、Joshua J. Smith、Liam D. Corcoran、Katherine H. D. Ballem、Brian O. Patrick、Kevin M. Smith
DOI:10.1021/om900788c
日期:2009.12.14
half-sandwich β-diketiminate complexes, CpCr[(ArNCMe)2CH]X, X = I (2), CH3 (3), or Cl (4), were prepared. Compared to previously communicated complexes with Ar = 2,6-iPr2C6H3 (Dpp, a), Cr(III) complexes with less sterically demanding ligands such as Ar = 2,6-Me2C6H3 (Xyl, b), 2,4,6-Me3C6H2 (Mes, c), or 2,6-Et2C6H3 (Dep, d) were more readily synthesized via salt metathesis reactions. Iodide compounds 2b−d were
制备了一系列Cr(III)半三明治β-二酮化合物,CpCr [(ArNCMe)2 CH] X,X = I(2),CH 3(3)或Cl(4)。与先前传达的Ar = 2,6- i Pr 2 C 6 H 3(Dpp,a)的配合物相比,具有较少空间需求配体的Cr(III)配合物,例如Ar = 2,6-Me 2 C 6 H 3( Xyl,b),2,4,6-Me 3 C 6 H 2(Mes,c)或2,6-Et 2 C 6H 3(Dep,d)更容易通过盐复分解反应合成。通过用一半当量的碘氧化相应的Cr(II)物种CpCr [(ArNCMe)2 CH] 1b - d制备碘化物2b - d。由两步一锅法从无水CrCl 3制备氯化铬(III)络合物CpCr [(ArNCMe)2 CH] Cl 4c - d。MeMgI与任一的Cr(III)氯化物或碘化物的前体反应得到在Cr(III)络合物甲基CPCR [(ArNCMe)2