A number of C- and S-shaped perylene diimide (PDI) heterohelicenes with high dipole moments were synthesized from simple perylene tetrabutylester (PTE). Taking advantage of the weak coordination ability of the sterically crowded peri ester groups in PTE, efficient Rh­(III)-catalyzed 2,8- and 2,11-bisiodinations of the perylene core were realized. The 2,8- and 2,11-diiodinated PTEs and PDIs represent key synthons for further ortho-π-extensions. In contrast to most helical π-skeletons that feature loose molecular packings, enantiomerically pure C-shaped PDI azahelicenes adopt unique spiral-stair-like π-stacking superstructures.

The living standards of people is increasing day by day, they also have pursued more on health. Physical exercise is a kind of way that people pursue physical health. With more and more people participate in physical exercises, Chinese sports venues amount has become a topic of people's concerns. The paper based on all previous sports venues statistical quantity, from indoors venues, outdoors venues, growth rate, accumulative quantity multiple perspectives, utilizes grey model to predict future Chinese each kind of venues status. By comprehensive analyzing, it gets following conclusions that indoors sports venues' completion speed is larger than outdoors sports venues' completion speed. Sports venues' each kind of field growth rate until year 2044-2049 will get close to 0% and arrive at saturation. Indoors sports venues may replace outdoors sports venues.