1,1,1a,7a-四氯-1a,2,7,7a-四氢-2,7-二苯基环丙烷[ b ]萘(5 )在脱氢卤代反应中提供可分离的宝石-二卤代杂环丙烷[ b ]萘(7)。四溴类似物(6)没有。所述的反应宝石-dihalide(7)具有小过量苯基-或乙基-溴化镁的令人惊奇地导致在卤素交换和形成宝石-dibromocyclopropa [ b以高收率]萘(8)。只有大量过量的格氏试剂,(7)的卤代取代基才被烷基和芳基取代。而宝石-二乙基衍生物(13)是可分离的,则宝石-二苯基化合物(12)容易断裂,重新排列为苯并[ b ]芴(18)。对于二氯化宝石(7),甲基碘化镁等效于单卤素交换和格利雅还原反应,得到苯并[ c ]芴(20)。
Electro-organic reactions. Part 54. Quinodimethane chemistry. Part 2. Electrogeneration and reactivity of o-quinodimethanes
作者:James H. P. Utley、Shalini Ramesh、Xavier Salvatella、Sabine Szunerits、Majid Motevalli、Merete F. Nielsen
DOI:10.1039/b007476o
日期:——
electrochemical generation and characterisation of a variety of o-quinodimethanes (o-QDMs) are described together with the outcome of preparative experiments in which they are key intermediates. The quinodimethanes are conveniently formed, in DMF, by both direct and redox-catalysed electroreduction of 1,2-bis(halomethyl)arenes. Their predominant reaction is polymerisation to poly(o-xylylene) (o-PX) polymers
Reaction of Trialkyl(dibromomethyl)silanes or 1,2-Bis(dibromomethyl)benzene with Triorganomanganates. A Facile and Selective Synthesis of Alkenylsilanes and 1,2-Diaryl-1,2-dihydrobenzocyclobutenes
stereoselectivity in good yields. The reaction of trialkyl(dibromomethyl)silanes with alkylmagnesium halides proceeded in the presence of a catalytic amount of manganese(II) chloride. Treatment of 1,2-bis(dibromomethyl)benzene with triphenylmanganate gave 1,2-diphenyl-1,2-dihydrobenzocyclobutene.
用衍生自氯化锰 (II) 和三摩尔量的格氏试剂或烷基锂的三烷基锰酸盐处理三烷基(二溴甲基)硅烷,以良好的收率提供具有高立体选择性的(E)-1-三烷基甲硅烷基-1-烯烃。三烷基(二溴甲基)硅烷与烷基卤化镁的反应在催化量的氯化锰(II)存在下进行。用三苯基锰酸盐处理 1,2-双(二溴甲基)苯得到 1,2-二苯基-1,2-二氢苯并环丁烯。
Spiroconjugation, dimerisation, and ultraviolet absorption of o-quinonoid compounds
作者:J. M. Holland、D. W. Jones
DOI:10.1039/c29700000122
日期:——
The ethyleneacetal of 1,3-diphenylisoindenone, 1,2,3-triphenylbenzo[c]phosphole2-oxide, and 2-methyl-1,3-diphenylbenzo[c]phosphole2-oxide have been generated in solution; the u.v. absorption and (4 + 2)π dimerisation of these compounds is attributed to spiroconjugation.