Bowl-shaped π-conjugated compounds including partial structures of the fullerenes, which are called "buckybowls", are of importance not only as model compounds of fullerenes but also as their own chemical and physical properties. Heteroatom-containing buckybowls (heterobuckybowls) have also been expected to exhibit unique physical characters. For example, in solution they show the characteristic dynamic behavior such as bowl-to-bowl inversion. On the other hand, they sometimes favor stacking structure in a concave-convex fashion in the solid state, giving excellent electron conductivity. Furthermore, some buckybowls are conceivable to possess the bowl-chirality if the racemization process, as equal as bowl-to-bowl inversion, is slow enough to be isolated. However, very few buckybowls/heterobuckybowls has been achieved for preparation mainly due to their strained structure, and no report on the preparation of chiralbowls has appeared. In addition, most of thus-reported procedures are performed under severe reaction conditions, limiting the sort of the introducible atoms/functional groups.
In the present works, we develop the rational route to the various kinds of buckybowls/heterobuckybowls using the organic synthesis approach. Representative projects are as follows:
We are aiming to elucidate the basic principle in order to synthesize novel compounds efficiently and selectively based on the chemical and physical properties of organic molecular. For this purpose, we are performing systematic studies of substittuent and solvent effects of novel reactions to propose the mechanism, considering the steric and electronic factor governing the reaction. It is necessary to investigate molecular orbital theoretically and kinetically to this goal.
Main Research theme