6 ± 2.1 kcal/mol. The acetylide complex, trans -[Pt(C C(CH 2 ) 3 NH 2 ) 2 (PTA) 2 ] ( 6 ) precipitated from a catalytic mixture involving cis -[PtBr 2 (PTA) 2 ] ( 2 ). Spectroscopic and kinetic studies indicated that 6 and its cis analog, 7 , were the predominant species in solution and that they were both active catalysts for the cyclization reaction. These data, in conjunction with the rate trends
使用通式顺式[MX 2(
PTA)2](M = Pd,Pt; X = Cl,Br,I;
PTA = 1,3,5-triaza-7-phosphaadamantanetan)的配合物研究催化在
水中,
甲醇和
二甲基亚砜(
DMSO)中进行
4-戊炔-1-胺的分子内加
氢胺化/环化成
2-甲基吡咯啉。动力学数据在50°C的均匀条件下通过1 H NMR测量,并显示出以下速率趋势:(i)在D 2 O中观察到最快的速率。(ii)这项研究的Pd络合物产生的速率比Pt更快复合体。(iii)卤化物的身份对催化速率没有影响。在D 2 O中,催化前体顺式-[PdCl 2(
PTA)2](4)的环化在底物中为零级,而在
金属络合物中为一级,ΔH‡= 20.0±2.1 kcal / mol,ΔS‡ = -7.4±6.3kcal / mol K,E a = 20.6±2.1kcal / mol。
乙炔络合物,从涉及顺式-[PtBr 2