Synthesis of chiral carbon nanobelt

本项目旨在合成史无前例的有望成为下一代纳米碳材料的手性碳纳米带分子，并随后研究其与富勒烯、模板碳纳米管生长等材料相关的主客体化学。该项目的第一阶段是合成目标分子。到目前为止，合成进展顺利，关键的二硼化中间体通过五步转化得到了关键的二硼化中间体，产率较高。目前正在研究的关键转化是铂介导的大环化反应。为了克服邻位取代底物的空间位阻，我们正在筛选不同溶剂、不同碱基和不同配体的反应条件。并对反应温度和时间进行了优化。同时，采用另一种合成方法，成功地合成了一种新的碳纳米带分子，其结构经核磁共振、MALDI-TOF MS和X-射线单晶分析确证。利用新的合成策略，我们成功地制备了一系列碳纳米带分子，并研究了它们的物理性质。

This project aims at the synthesis of unprecedented chiral carbon nanobelt molecule that could be the next generation nanocarbon material, and subsequently investigate their host guest chemistry with fullerenes, templated carbon nanotube growth and other material related applications. The first stage of the project is to synthesize the target molecule. So far, the synthesis was conducted smoothly and the key diborylated intermediate was obtained by a five-step transformation in good yield from commercially available compound. The key transformation, a platinum mediated macrocylization reaction, is currently being examined. To overcome the steric hindrance of the ortho-substituted substrate, we are now screening reaction conditions with different solvent, base and ligand. Also the reaction temperature and time will be optimized. At the same time, using an alternative synthetic approach, a new carbon nanobelt molecule has been successfully synthesized and the structure was unambiguously confirmed by NMR, MALDI-TOF MS and X-ray single crystal analysis. With the new synthetic strategy, we successfully prepared a series of carbon nanobelt molecules and studied their physical properties.