Solid-State Photoisomerization of Perchloro-p-xylene to Perchloro-1-methyl-1,3,6-cycloheptatriene: A Serendipitous Synthesis of Perchloroheptafulvene
作者:V. M. Domingo、J. Castaner、J. Riera、E. Molins、M. Mas
DOI:10.1021/jo00094a019
日期:1994.7
Perchloroheptafulvene (4) is prepared by photoisomerization of perchloro-p-xylene (1) in a surprising and key-step solid-state ring-expansion reaction yielding perchloro-1-methyl-1,3,6-cycloheptatriene (3), followed by dechlorination of 3 with SnCl2.2H(2)O. X-ray analyses of 3 and 4 are reported and discussed in relation to the already known crystal structure of xylene 1 suggesting that in the first step the strained molecular geometry of 1 assists its ring expansion.