Cyclic and Polycyclic Polystannanes

在有机动力学项目的支持下， 最近从卡内基梅隆大学搬到了加州 工学院，将研究合成和化学 环状和多环聚锡烷。合成将是 在每种情况下，通过描绘立体和电子 控制一系列反应的因素， 目标环状和多环有机锡烷。一旦每个 合成已完成，新的有机锡烷将是 通过使用各种光谱方法进行研究， 确认其分子结构并研究其性质 在新的分子系统中与锡键合。因此，数据 它将与现有的理论模型相结合。 %%% 西塔博士的研究计划是关于提高 对环状和多环化学的理解水平 有机锡化合物，目前享有的 碳环体系西塔博士对合成和 这些新系统的化学成分有望提供新的 洞察：（一）空间应变的表达方式 最终，在结构上适应循环， 多环有机锡化合物，（二）新的发展 有机锡基材料，和（iii）发展 有机锡化学合成策略。西塔博士的研究 可能会导致对各种 控制结构/键合/物理性能的因素 系统中的化学反应性， 重元素（如锡）。他在这方面的工作很可能 对有机和主族有机金属化合物感兴趣 化学家和结构化学家。

With support from the Organic Dynamics Program, Dr. Sita, who recently moved from Carnegie Mellon University to California Institute of Technology, will study the synthesis and chemistry of cyclic and polycyclic polystannanes. Syntheses will be pursued in each case by delineating the steric and electronic factors which govern a proposed series of reactions that lead to the target cyclic and polycyclic organostannanes. Once each synthesis has been achieved, the new organostannane will be studied by using a variety of spectroscopic methods in order to confirm its molecular structure and to investigate the nature of bonding to tin in the new molecular system. The data thereby obtained will be correlated with existing theoretical models. %%% Dr. Sita's research program is concerned with elevating the level of understanding of the cyclic and polycyclic chemistry of organotin compounds to that which is presently enjoyed by carbocyclic systems. Dr. Sita's research on the synthesis and chemistry of these new systems is expected to provide new insight into: (i) the ways in which steric strain is expressed and, ultimately, accomodated structurally in cyclic and polycyclic organotin compounds, (ii) the development of new organotin-based materials, and (iii) the development of synthetic strategy in organotin chemistry. Dr. Sita's research is likely to lead to improved understanding of the various factors which govern structure/bonding/physical property relationships and chemical reactivity in systems that contain heavy elements (such as tin). His work in this area is likely to be of interest to organic and main group organometallic chemists as well as to structural chemists.