Reactions of benzocyclobutene chromium complexes with carbon, nitrogen and oxygen nucleophiles: nucleophilic addition and unexpected proximal ring opening reactions
作者:Michael Brands、Hans G. Wey、Richard Goddard、Holger Butenschön
DOI:10.1016/0020-1693(94)03870-8
日期:1994.6
The fact that the intermolecular cycloaddition reaction for 16 is possible in the presence of a dienophile is taken as evidence for an equilibrium between the alcoholate 17 and the two ring opened products 16 and 18. The proximal ring opening of 6 is not observed when the free organic ligand 21 is used as the educt. Ketone complexes 1 and 25 undergo proximal ring opening reaction when treated with
可以将三羰基(η6-1-氧代苯并环丁烯)铬(0)(1)转化为具有取代基R(RCH3,CH2CH2,(CH2)4CH complexCH2,(CH2)4OSi(Me)2tBu)在络合物外表面的Cl处。通过对三甲基甲硅烷基醚8(C16H18CrO4Si:a = 8.693(1),b = 9.490(1),c = 11.063(1)A,α= 97.51(1),的X射线晶体结构分析证明了相对构型β= 110.32(1),γ= 95.38(1)°,三斜线,空间群P1(No.2),R = 0.037,Rw = 0.052观察到的4609次反射。通过阴离子促进的开环从17衍生而来,意外地导致形成12,这是16中羟基和配位芳族环之间的带芳香环的近端键的开口的产物。在亲二烯体的存在下可能发生16的分子间环加成反应这一事实被视为表明醇盐17与两个开环产物16和18之间达到平衡的证据。游离时未观察到近端开环6