Dehydroannulenes. II. Syntheses of Diatropic Dimethyldiphenyl-and Tetraphenyl-tetrakisdehydro[18]annulenes
作者:Tsutomu Katakami、Kunisuke Fukui、Tetsuhiko Okamoto、Masazumi Nakagawa
DOI:10.1246/bcsj.49.297
日期:1976.1
stability is provided by introduction of phenyl groups accompanied with decrease in solubility of the annulene. Dimethyldiphenyl derivative was prepared by two different routes which will lead to isomers (VI and XII) with respect to the relative positions of the diacetylene and hexapentaene linkages to the substituent groups. The isomers (VI and XII) can be regarded as presumably identical, but precise
已经进行了二甲基二苯基-(VI 和 XII) 和四苯基四脱氢 [18] 环烯 (XVII) 的合成。发现用于合成四甲基四脱氢[18]轮烯的反应序列一般可用于制备具有各种取代基的四脱氢[18]轮烯。发现环烯(VI、XII 和 XVII)具有很强的互向性,具有高构象稳定性。通过引入苯基并伴随环烯的溶解度降低而提供了显着的稳定性。二甲基二苯基衍生物是通过两种不同的途径制备的,这两种途径将产生异构体(VI 和 XII),这些途径就二乙炔和六戊烯键与取代基的相对位置而言。异构体(VI 和 XII)可以被认为是相同的,但无法获得 NMR 和 UV 光谱的精确一致性。与四甲基类似物相比,苯基取代的环烯的紫外光谱的红移表明,ph...