Quadrannulene: A Nonclassical Fullerene Fragment (pages 399–402)
Bharat, Radha Bhola, Thomas Bally, Alessandro Valente, Michał K. Cyrański, Łukasz Dobrzycki, Stephen M. Spain, Paweł Rempała, Matthew R. Chin and Benjamin T. King
Article first published online: 2 DEC 2009 | DOI: 10.1002/anie.200905633
Approaching the curve: A circulene (see picture) has been prepared in five steps. Although the circulene motif has never before been observed, these findings suggest that the square may join the pentagon as a motif for viable fullerenes.