@article{oai:kansai-u.repo.nii.ac.jp:00011468,
 author = {Roland, Boese and Jordi, Benet-Buchholz and Amnon, Stanger and Tanaka, Koichi and Toda, Fumio},
 issue = {4},
 journal = {Chemical Communications},
 month = {Jan},
 note = {The X-ray determined structure of the title compound is reported; it was found that the annelated bonds are the longest observed in a benzene derivative [1.540(5) Å]; ab initio calculations (at the B3LYP/6-31G* and MP2/6-31G* levels of theory) were used in order to understand the electronic and structural properties of the compound.},
 pages = {319--320},
 title = {The crystal and molecular structure of 2,7-di-tert-butyl-4,5,9,10-tetraphenylbenzo[1,2,:4,5]dicyclobutadiene: an exceptionally long C–C aromatic bond},
 volume = {1999},
 year = {1999}
}