On the equilibrium between molecular complexes and trigonal bipyramidal adducts of diaryl selenide dibromides in solution
作者:War? Nakanishi、Satoko Hayashi
DOI:10.1002/hc.1056
日期:——
both δ(Ci) in 5. The equilibrium between MC's and TB adducts is clearly shown in 4. The equilibrium constants K (K = [MC]/[TB]) are also calculated: they are ca. 0.20 for 2 and 3 and 0.16, 0.33, and 0.73 for 4i, 4a, and 4e, respectively. The contribution of MC is negligible in 1a, and the contribution of the TB adduct is negligible in 5. The results show that TB adducts become unstable relative to MCs
已经设计了一种可视化 ArSeBr2Ar' 的分子复合物 (MC) 和三角双锥 (TB) 加合物之间的平衡的方法。TB 地层引起同碳 δ(Ci) 的大的下场位移,而上场位移是 MC 地层中 δ(Ci) 的特征。因此,如果制备了这样的 ArSeAr',当溴被添加到 ArSeAr' 溶液中时,平衡被清楚地证明,该 ArSeAr' 显示在一个 ipso 碳上的上场位移,而另一个则向下场。测量 4-YC6H4SePh (1a–1g)、2-YC6H4SePh (2d, 2e, 2h), 2-YC6H4SeC6H4Br-p (3d, 3e, 3h), 2-O2NC6H4SeC6H4Y-的卤素引起的化学位移 (Δδ) (4a, 4e, 4i), 和 2,4-(O2N)2C6H3SeC6H4Y-p (5a, 5e, 5i), 其中 Y = H (a), OMe (b), Me (c), Cl (d), Br