Synthesis and Properties of Methano-Bridged Bisdehydro[17]-, -[19]-, -[21]annulenones and the Related Compounds
作者:Hiroyuki Higuchi、Seiken Kiyoto、Chiaki Sakon、Naoki Hiraiwa、Kaori Asano、Shiro Kondo、Juro Ojima、Gaku Yamamoto
DOI:10.1246/bcsj.68.3519
日期:1995.12
well as their methylated and benzannelated derivatives, were synthesized and their tropic properties were studied by NMR and UV spectra under neutral and acidic conditions. The tropicity in these compounds was found to be lower than in their non-bridged monocyclic counterparts. Thus the methano-bridge works to decrease the planarity of the peripherally conjugated system.
14-Methyl-10,12-bisdehydro-4,9-methano-1H-[17]annulen-1-one, 14-methyl-10,12-bisdehydro-4,9-methano-1H-[19]annulen-合成了 1-one 和 16-methyl-12,14-bisdehydro-6,11-methano-1H-[21]annulen-1-one 及其甲基化和苯甲酰化衍生物,并研究了它们的热带特性。中性和酸性条件下的核磁共振和紫外光谱。发现这些化合物的向性低于它们的非桥连单环对应物。因此,甲烷桥的作用是降低外围共轭系统的平面度。