Polyfluoroaryl organometallic compounds. Part VIII. Synthesis of and nucleophilic substitution in octafluorodibenzofuran
作者:R. D. Chambers、J. A. Cunningham、D. J. Spring
DOI:10.1039/j39680001560
日期:——
sulphide with 85% hydrogen peroxide in trifluoroacetic acid anhydride gives the corresponding dioxides (IV) and (V). The principal mode of decomposition of octafluorodibenzothiophen 5,5-dioxide (IV) on pyrolysis, and partly on electron bombardment, is by loss of SO and pyrolysis of the dioxide (IV) gives the new heterocycle octafluorodibenzofuran (VIII), while similar pyrolysis of di(pentafluorophenyl)
用阮内镍去除八氟二苯并噻吩(I)中的硫不会得到八氟联苯(III);仅获得联苯。用三氟乙酸酐中的85%过氧化氢氧化二苯并噻吩(I)或二(五氟苯基)硫化物得到相应的二氧化物(IV)和(V)。在热解过程中,部分在电子轰击下,八氟二苯并噻吩5,5-二氧化物(IV)分解的主要模式是通过SO的损失和二氧化物(IV)的热解产生了新的杂环八氟二苯并呋喃(VIII),而二(五氟苯基)砜(V)仅导致SO 2损失。在八氟二苯并呋喃(VIII)中的3-位然后在7位发生甲氧基离子的亲核取代,该取向可从产物的1 H和19 F nmr光谱。讨论了控制这些系统中亲核取代的因素。