Hitherto unknown triaza[18]annulenes 3-5 and 7-10 are synthesized by cyclocondensation of tripyrranes 2 with azulene-1,3-dicarboxaldehyde (1) or cycloheptatriene-1,6-dicarboxaldehyde (6). Their spectroscopical properties with respect to 18Ï aromaticity are discussed.
迄今未知的三氮杂[18]环轮烯3-5和7-10是通过三
吡咯烷2与蔥-1,3-二甲酰基(1)或
环庚三烯-1,6-二甲酰基(6)的环加成反应合成的。关于它们的18π芳香性的光谱性质进行了讨论。