systematic generation of arynes bearing π-extended systems. Diels-Alder reactions of these arynes with isobenzofurans afforded the corresponding cycloadducts whose reductive aromatisation in an SnCl2 /HBr system furnished fully aromatised benzotriphenylenes. In addition, oxidative aryl-aryl coupling (the Scholl reaction) of these benzotriphenylenes facilitated the synthesis of 'half HBCs' (hexabenzocoronenes)
cyclopentene moiety undergo indium(III)‐catalyzed Friedel–Crafts‐type cyclization with subsequent ring expansion and dehydrogenation to afford fluorinated polycyclic aromatic hydrocarbons in high yields. The introduction of an Ar group was effected by in situ halogenation of the intermediary indium species and a subsequent Suzuki–Miyaura reaction.
Regiospecifically Fluorinated Polycyclic Aromatic Hydrocarbons via Julia–Kocienski Olefination and Oxidative Photocyclization. Effect of Fluorine Atom Substitution on Molecular Shape
photocyclizations were performed at higher dilutions. To evaluate the effect of fluorineatom 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 fluorineatom 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
Synthesis of monofluorobenzo[c]phenanthrenes
作者:Yitzhak Ittah、Donald M. Jerina
DOI:10.1016/s0022-1139(00)82388-x
日期:1980.8
Synthesis of 1-, 2-, 3- and 4-fluorobenzo[c]phenanthrenes by photocyclization of appropriate β-naphth-l-yl fluorostyrenes is described. An improved synthesis of 6-fluorobenzo[c]phenanthrene was developed. Partial photochemical debromination occured upon cyclization of 2-bromo-7-fluorobenzo[c]phenanthrene.