Azuleno[2,1-b]-4,9-methano[11]annulenium perchlorate: A peripheral 18-Pi electron diatropic system
                                
                                    
                                        作者:Shigeyasu Kuroda、Kazuo Yamazaki、Sunao Maeda、Takeshi Sakaguchi、Hiroyuki Iwaki、Masaki Yamada、Shimao Ichiro、Masafumi Yasunami                                    
                                    
                                        DOI:10.1016/s0040-4039(00)74852-0
                                    
                                    
                                        日期:1991.1
                                    
                                    Titled azulene-condensed bridged [11]annulenium perchlorate has been synthesized as stable crystals.  Its H-1- and C-13-NMR spectra and other physical properties showed it to be a peripheral 18-pi electron diatropic compound and its H-1-NMR spectrum in trifluoroacetic acid indicates the formation of dicationic species.