Double Diels−Alder Strategies to Soluble 2,9- and 2,9,6,13-Tetraethynylpentacenes, Photolytic [4 + 4] Cycloadditions, and Pentacene Crystal Packing
作者:Christophe P. Bénard、Zhe Geng、Matthew A. Heuft、Kelly VanCrey、Alex G. Fallis
DOI:10.1021/jo0709807
日期:2007.9.1
10-di(triisopropylsilylethynyl)pentacene (11), respectively. Photodimerization of these pentacenes afforded the air-stable [4 + 4] cycloaddition pentacene precursors (tetrakisnaphthotricyclo[4.2.2.22,5]dodecanes, 12−15). Thermal cycloreversion of the dimers (∼13 J/g, ∼4 kcal/mol) produces the parent pentacenes (10 or 11). The tetrasubstituted family utilized a parallel route with extra versatility as
通过互补的,通用的双Diels-Alder制备了四类新的有机溶剂可溶的乙炔基并五苯衍生物(2,9-,2,10-,2,6,9,13-,2,6,10,13-)策略。可以操纵A,C和E环上的官能团,以增加溶解度,调节电子器件并改变固态堆积。二烯2和1,4,5,8-蒽醌(3)或邻喹二甲烷19与1-丁基-3-甲基咪唑啉碘化物(18)作为碘化物源(比NaI显着改善)和苯醌(20)的环加成反应随后)通过原位芳构化,得到醌4,5,21,和22。对于2,9和2,10系列,开发了一种单锅去甲硅烷基化/琐碎反应。钯(0)偶联和还原芳构化分别得到2,9-二(三异丙基甲硅烷基乙炔基)并五苯(10)和2,10-二(三异丙基甲硅烷基乙炔基)并五苯(11)。这些的并五苯,得到空气稳定的光二[4 + 4]环加成并五苯前体(tetrakisnaphthotricyclo [4.2.2.2 2,5 ]十二烷,12 - 15)。二聚体的热环还原(〜13