由复合物催化的乙二化反应的DFT计算研究
Andrea Bottoni1, Alicia Perez Higueruelo, Gian Pietro Miscione
1Dipartimento di Chimica "G.Ciamician", Universita' di Bologna, via Selmi 2, 40126 Bologna, Italy. andrea@ciamserv.unibo.it
这项研究详细介绍了使用DFT ((B3LYP) 计算的化乙基化. 催化循环涉及氧化添加,多步骤的基转移和异构化,最终形成 (Z) -bis (基) 乙烯.
科学领域:
- 有机金属化学 有机金属化学
- 计算化学计算化学
- 催化剂是一种催化剂.
背景情况:
- 复合物是有机合成中的关键催化剂.
- 基的双化提供了一条通往有价值的含有机化合物的途径.
- 了解催化机制是优化反应效率的关键.
研究的目的:
- 为了阐明酸盐的促进二化的详细的催化循环.
- 在B3LYP层面使用密度函数理论 (DFT) 调查反应机制.
- 提供关于 (Z) -bis () 乙烯的形成的见解.
主要方法:
- 使用B3LYP函数的密度函数理论 (DFT) 计算.
- 使用乙,迪沙和复合物的催化系统建模 (Pd (((PH ((3)) ((2)).
- 对反应途径,中间体和能量障碍物的分析.
主要成果:
- 催化循环以易于氧化添加迪西兰到Pd(PH(3))(2) 开始.
- 基基向基基的转移是逐步发生的,不是协调的,涉及中间体和异构化.
- 通过特定的异构化途径,有利于形成 (Z) -bis(乙烯产物.
- 整体的催化过程是外热的,释放了41.54 kcal mol ((-1).
结论:
- DFT (B3LYP) 调查揭示了催化二化的多步机制.
- 介质的同质化对于第二个C-Si键的快速形成至关重要,导致观察到的 (Z) 产物.
- 计算的整体外热度与实验观测结果一致,验证了拟议的机制.
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