Dibenzopentalenes from B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Induced Cyclization Reactions of 1,2-Bis(phenylethynyl)benzenes
作者:Chao Chen、Marcel Harhausen、René Liedtke、Kathrin Bussmann、Aiko Fukazawa、Shigehiro Yamaguchi、Jeffrey L. Petersen、Constantin G. Daniliuc、Roland Fröhlich、Gerald Kehr、Gerhard Erker
DOI:10.1002/anie.201300871
日期:2013.6.3
'Lene' and mean: The strong Lewis acid B(C6F5)3 efficiently converts some bis(arylethynyl)benzenes into dibenzopentalenes through a series of Lewis acid induced cyclizationreactions at room temperature. Thus the reaction has the potential to be useful in the synthesis of substituted dibenzopentalene derivatives which are difficult to make by conventional means.
“ Lene”和均值:强路易斯酸B(C 6 F 5)3通过一系列路易斯酸在室温下诱导的环化反应,有效地将一些双(芳基乙炔基)苯转化为二苯并戊烯。因此,该反应具有用于合成取代的二苯并戊烯衍生物的潜力,这是用常规方法难以制备的。
The Direct Iodination of Polyalkylbenzenes Bearing Bulky Groups
作者:Hitomi Suzuki、Kiyomi Nakamura、Ryozo Goto
DOI:10.1246/bcsj.39.128
日期:1966.1
The following polyalkylbenzenes bearing bulky groups have been subjected to direct iodination using iodine and periodic acid, and the corresponding mono-iodinated products have been obtained in fairly high yields: 4-t-butyl-1, 2-dimethylbenzene, 5-t-butyl-1, 3-dimethylbenzene, 5-t-butyl-1, 2, 3-trimethylbenzene, 1, 2, 4, 5-tetraisopropylbenzene and p-di-t-butylbenzene. The polyiodination of polymethylbenzenes has also proceeded smoothly, giving polyiodo compounds in high yields. A comparison of various direct methods has proved the above reagent to be the best iodinating agent for a variety of polyalkylbenzenes.
Palladium on Carbon: An Efficient, Heterogeneous and Reusable Catalytic System for Carbonylative Synthesis of<i>N</i>-Substituted Phthalimides
作者:Mayur V. Khedkar、Shoeb R. Khan、Dinesh N. Sawant、Dattatraya B. Bagal、Bhalchandra M. Bhanage
DOI:10.1002/adsc.201100460
日期:2011.12
application of palladium on carbon (Pd/C) as a heterogeneous recyclable catalyst was investigated for the double carbonylation of o-dihaloarenes with amines providing excellent yield of N-substituted phthalimides in shorter reaction time as compared to earlier reported homogeneous protocols. Furthermore, the scope of the developed protocol was applied for the synthesis N-substituted phthalimides from o-halobenzoates
Gold Vinylidene Complexes: Intermolecular C(sp<sup>3</sup>)H Insertions and Cyclopropanations Pathways
作者:A. Stephen K. Hashmi、Marcel Wieteck、Ingo Braun、Matthias Rudolph、Frank Rominger
DOI:10.1002/anie.201204015
日期:2012.10.15
Highly reactive gold vinylidenespecies are used for intermolecular C(sp3)H insertions into unactivated alkanes (see scheme). In addition, they can be regarded as synthons for alkylidene carbenes. Initiated by cyclopropanation of the vinylidenespecies/alkylidene carbenoide, cyclobutene derivatives are formed in a diastereoselective fashion by a ring‐enlargement cascade in only one step.