作者:Ryo Mizunuma、Teruhiko Tanaka、Yoshihiro Nakamura、Yuki Kamijima、Yoshio Kabe
DOI:10.1016/j.tet.2017.12.023
日期:2018.2
Recent reports describe the different products resulting from the reaction of C-60 with benzyne generated from anthranilic acid derivatives and isoamyl nitrate in the presence and absence of triethylamine. Reinvestigation here via H-1, C-13, HMBC NMR and Mass spectroscopy elucidates that these products are the [6,6] closed C-60-fused delta lactones, and not the [5,6] open fulleroids which would result from benzyne addition. Furthermore, theoretical calculations show that the open isomer [5,6] benzyne addition is less stable than the [5,6] closed isomer as an isolable product. (C) 2017 Elsevier Ltd. All rights reserved.