New Organic Intermediates Containing Silicon or Tin

在这个有机动力学项目中，来自西北大学化学系的Joseph B. Lambert教授将研究“含硅或锡的新型有机中间体”。他将探索元素与相邻正电荷之间的相互作用，以研究超共轭现象。将努力利用硅离子为碳硅和硅硅键的形成提供新方法，并作为聚合反应的催化剂，可能导致新材料的产生。带正电的含有硅、锡或其它主族元素的物质将用于研究超共轭。锡和铅将用于研究许多sigma键上正电荷的离域，以证明一种称为多级超共轭的新机制。将研究乙烯基和饱和体系中超共轭的空间依赖性。将设计新的策略，以获得具有更大的离子性和稳定性的硅、锗和磷离子。硅离子将为碳硅和硅硅键的形成提供新的方法，并作为聚合反应的催化剂，可能导致新材料的产生。锡稳定正电荷的特殊能力将用于制造新的苯基和乙烯基阳离子。

In this project in the Organic Dynamics Program, Professor Joseph B. Lambert from the Chemistry Department at Northwestern University will study "New Organic Intermediates Containing Silicon or Tin". He will explore the interactions between the element and adjacent positive charge in order to study the phenomenon of hyperconjugation. Efforts will be made to use silylenium ions to provide new methods for carbon-silicon and silicon-silicon bond formation and to serve as catalysts for polymerization reactions that may lead to new materials. Positively charged species containing silicon, tin, or other Main Group elements will be used to study hyperconjugation. Tin and lead will be used to study delocalization of positive charge over many sigma bonds in order to prove a new mechanism called multiple stage hyperconjugation. The spatial dependence of hyperconjugation in vinyl and saturated systems will be studied. New strategies will be devised for obtaining silylenium, germylenium, and phosphenium ions with greater ionicity and stability. Silylenium ions will be used to provide new methods for carbon-silicon and silicon-silicon bond formation and to serve as catalysts for polymerization reactions that may lead to new materials. The exceptional ability of tin to stabilize positive charge will be used to create new phenyl and vinyl cations.