M. Yasunami, T. Hioki, Y. Kitamori
Aug 1, 1993
Citations
0
Influential Citations
18
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
1H- and 3H-Cyclopent[a]azulenes having an electron withdrawing group, such as a methoxycarbonyl or a cyano group, at the 9-position were synthesized from their dihydro compounds by means of bromination with NBS and succeeding dehydrobromination by refluxing in chloroform. Base-catalyzed condensation of these cyclopent[a]azulenes with carbonyl compounds afforded 1-methylene-1H- and 3-methylene-3H-cyclopent[a]azulene derivatives having an electron withdrawing group at the 9-position. The physical properties of these methylenecyclopent[a]azulenes are also discussed.