Reaction of [σ:η<sup>5</sup>-(C<sub>9</sub>H<sub>6</sub>)C<sub>2</sub>B<sub>9</sub>H<sub>10</sub>]Zr(NMe<sub>2</sub>)(DME) with Guanidines: Metallacarborane-Mediated C−N Bond Cleavage and 1,5-Sigmatropic Rearrangement
作者:Hao Shen、Hoi-Shan Chan、Zuowei Xie
DOI:10.1021/ja0754498
日期:2007.10.1
Treatment of [sigma:(eta 5)-(C9H6)C2B9H10]Zr(NMe2)(DME) with 2 equiv of guanidines (i) PrNHC(NR2)=N-i Pr (R = Me, Et) in refluxing toluene gave unprecedented complexes [eta:(sigma 5)-2-[C=N-i Pr(NHi Pr)]C9H5}C2B9H10]eta(2)-[(i)112-(i PrN)(2)C(NR2)] (R = Me, Et). This communication describes the mechanism by which they are formed. Experimental results show that guanidinates are not inert ligands in the present cases that can undergo C-N bond cleavage to generate amido and carbodiimide that subsequently insert into the Zr-C bond to form the final product via 1,5-sigmatropic shift.