Regiospecifically Fluorinated Polycyclic Aromatic Hydrocarbons via Julia–Kocienski Olefination and Oxidative Photocyclization. Effect of Fluorine Atom Substitution on Molecular Shape
作者:Shaibal Banerjee、Saikat Sinha、Padmanava Pradhan、Alessio Caruso、Daniel Liebowitz、Damon Parrish、Miriam Rossi、Barbara Zajc
DOI:10.1021/acs.joc.5b02580
日期:2016.5.20
photocyclizations were performed at higher dilutions. To evaluate the effect of fluorine atom on molecular shapes, X-ray data for 5- and 6-fluorobenzo[c]phenanthrene, 6-fluorochrysene, 9- and 10-fluorobenzo[g]chrysene, and unfluorinated chrysene as well as benzo[g]chrysene were obtained and compared. The fluorine atom caused a small deviation from planarity in the chrysene series and decreased nonplanarity
描述了区域特异性氟化多环芳烃(PAHs)的模块合成。通过Julia-Kocienski烯烃合成法(产率70-99%)合成的1,2-二芳基氟烯烃被转化为异构的5和6-氟苯并[ c ]菲,5和6-氟苯以及9和10-苯并[ g ]氧化(66-83%的产率)通过氧化光环化而得到。光环化为6-氟代丙烯的过程比1-苯乙烯基萘转化为苯的过程更慢。更高的氟代烯烃稀释度导致更快的环化。因此,以更高的稀释度进行光环化。为了评估氟原子对分子形状的影响,对5-和6-氟苯并[ c ]菲,6-氟丙烯,9-和10-氟苯并[ g ]的X射线数据获得并比较了未氟化的苯和苯并[ g ]苯。氟原子引起了苯并[ c ]菲系列中平面度的小的偏离,并降低了苯并[ c ]菲衍生物的非平面性,但其影响在苯并[ g ]苯系列中最为明显。在9-氟苯并[ g ]丙烯中观察到了该分子的显着扁平化,其中海湾区域F-9和H-8之间的原子间距离短,为2