2,5,8,11,14,17-Hexa-t-butyldecacyclene and 1,7,13-/1,6,12-tri-t-butyldecacyclene: Possible precursors for bowl-shaped polycyclic arenes
作者:Klaus Zimmermann、Richard Goddard、Carl Krüger、Matthias W. Haenel
DOI:10.1016/0040-4039(96)01933-8
日期:1996.11
Decacyclene (2) was converted into 2,5,8,11,14,17-hexa-t-butyldecacyclene (4) by Friedel-Crafts alkylation using chloride in 1,2-dichlorobenzene. Dehydrogenating cyclotrimerization of 5-t-butylacenaphthene by reaction with elemental sulfur resulted in 1,7,13- and 1,6,12-tri-t-butyldecacyclene () in the expected statistical 1:3 isomeric ratio. Single crystal X-ray structure analysis showed 4 to possess
十环烯(2)转化为2,5,8,11,14,17-六吨-butyldecacyclene(4通过使用的Friedel-Crafts烷基化反应)在1,2-二氯苯磺酰氯。脱氢-5-环三聚吨通过与元素硫反应-butylacenaphthene导致1,7,13-和1,6,12三-吨-butyldecacyclene(在预期的统计1):3异构体之比。单晶X射线结构分析表明4在晶体中具有非平面,非螺旋桨的C t构象。根据分子建模(力场计算),该非螺旋桨构型为12.7 kJ mol -1能量高于预期的D t螺旋桨构型。在能量上不利的非螺旋桨分子构象的观察归因于大体积叔丁基取代基的有利晶体堆积。