Mechanistic investigation of the thermal decomposition of Biphen(OPi-Pr)PtEt2: An entrance into C–C single bond activation?
作者:Klaus Ruhland、Eberhardt Herdtweck
DOI:10.1016/j.jorganchem.2005.04.048
日期:2005.11
temperature-independent. Selective deuteration at α and β position of the ethyl group, respectively, showed that β-H elimination takes place fast in comparison to the complete thermolysis. In the temperature range of 333–353 K only a scrambling of the deuterium atoms was found without further decomposition (temperature range: 333–353 K; ΔscramH‡ = 76.1 ± 15.2 kJ/mol, ΔscramS‡ = −80.7 ± 45.5 J/(mol K) for Biphen(OPi-Pr)PtEt2-d6)
Biphen(OP i -Pr)和(COD)PtCl 2产生Biphen(OP i -Pr)PtCl 2,经乙基格氏试剂处理后形成Biphen(OP i -Pr)PtEt 2。在353–383 K的温度范围内研究了Biphen (OP i -Pr)PtEt 2的热分解。观察到Pt(Ethene)加合物的清洁定量形成。已经确定了所有三种反应产物和两种其他具有苯基指代物而不是i -Pr的相关配合物处于固态的分子的X射线结构。对于与我的情结-Pr指与方形指的络合物相比,观察到与方形平面的决定性偏离。P–Pt–P角从Biphen(OP i -Pr)PtCl 2中的约95°增大到Biphen(OP i -Pr)Pt(乙烯)中的约120° ,迫使联苯的桥连C–C单键距Pt中心仅4.17Å的碎片。在13 C NMR光谱中未观察到桥接C原子与Pt中心之间的贯穿空间耦合。与前体配合物相比,在Biphen(OP