Dehydroannulenes. III. Synthesis and Properties of 1,5,10,14-Tetra-<i>tert</i>-butyl-6,8,15,17-tetrakisdehydro[18]annulene
作者:Sachiyo Tomita、Masazumi Nakagawa
DOI:10.1246/bcsj.49.302
日期:1976.1
In order to find out substituent groups which provide stability and solubility to tetrakisdehydro[18]annulene system without appreciable electronic interaction with the annulene ring, the synthesis of 1,5,10,14-tetra-tert-butyl-6,8,15,17-tetrakisdehydro[18]annulene (VIII) has been catrried out starting from 3-tert-butyl-2-penten-4-ynal (III). It was found that the tetra-tert-butyl derivative (VIII) is strongly diatropic, and more stable and much more soluble than tetramethyl-, dimethyl-, diphenyl-, and tetraphenyl-analogues. The electronic spectrum of tetra-tert-butyl derivative (VIII) was found to be closely related with that of tetramethyltetrakisdehydro[18]annulene indicating a minor electronic perturbation of tert-butyl groups on the annulene ring.
为了找出在不显著影响富烯环电子相互作用的条件下,能够为四脱氢[18]富烯体系提供稳定性和溶解性的取代基团,从3-叔丁基-2-戊烯-4-炔醛(III)出发,进行了1,5,10,14-四叔丁基-6,8,15,17-四脱氢[18]富烯(VIII)的合成。研究发现,四叔丁基衍生物(VIII)具有强烈的抗磁环流性质,比四甲基、二甲基、二苯基和四苯基类似物更稳定且溶解度更高。四叔丁基衍生物(VIII)的电子光谱与四甲基四脱氢[18]富烯的光谱密切相关,这表明叔丁基对富烯环的电子扰动较小。