π-Extended o-quinoidal tropone derivatives: experimental and theoretical studies of naphtho[2,3-c]tropone and anthro[2,3-c]tropone
作者:Masakazu Ohkita、Kieko Sano、Takanori Suzuki、Takashi Tsuji、Tadatake Sato、Hiroyuki Niino
DOI:10.1039/b400080n
日期:——
moiety. Experimentally, irradiation of 6,7-(2',3'-naphtho)bicyclo[3.2.0]hepta-3,6-dien-2-one (10) in a rigid glass at -196 degrees C leads to the formation of, which exhibits a characteristic UV-Vis absorption extending to 700 nm and undergoes rapid [pi 12 + pi 14] dimerization upon thawing the glass. In contrast, 6,7-(2',3'-anthro)bicyclo[3.2.0]hepta-3,6-dien-2-one (11) showed no sign of isomerization
在理论上和实验上都研究了pi扩展的邻喹啉酮托酮衍生物,萘并[2,3-c]托洛酮(3)和蒽[2,3-c]托洛酮(4)。已经进行了3-4和相关化合物在B3LYP水平上使用6-31G *基础集的几何优化,以及在RHF水平上使用6-31 + G *基础集的GIAO计算,以评估该化合物的贡献。这些分子的极化共振形式。GIAO计算得出的NICS(1)值表明,邻醌3和4的托酮环的芳香性比亲代托酮(1)显着增加,但以稠合的苯环为代价,这与显着的电子相符。这些分子在基态极化。另一方面,苯环或萘环与2,3-或4稠合 tropone的5位会导致所得tropone部分的芳香性降低。实验上,在-196摄氏度的刚性玻璃中辐射6,7-(2',3'-萘)双环[3.2.0]庚3,6-dien-2-one(10)导致形成它们显示出延伸至700 nm的特征性UV-Vis吸收,并且在融化玻璃后会迅速发生[pi 12 + pi 14]二聚化。相反,在相同反应条件下,6