Lewis acid-catalyzed tandem synthesis of 9-sulfonylamino- and 9-arylfluorenes
作者:Dayun Huang、Weiguang Yang、Jianlan Zhang、Xuesong Wang、Xinyan Wang、Yuefei Hu
DOI:10.1039/c6ra03889a
日期:——
A Lewis acid-catalyzed three-step tandem synthesis of 9-arylfluorene was developed by simply heating a mixture of 2-formyl biphenyl, TsNCO and an arene. In the absence of arene, a two-step tandem synthesis of 9-sulfonylaminofluorene was achieved. These advances were mainly attributed to the discovery of an anhydrous synthesis of N-tosyl arylaldimines from TsNCO and arylaldehydes.
A tandem ring-closing reaction was developed for the synthesis of 9-arylfluorenes and their derivatives. The reaction is metal-free, straightforward and efficient under warm conditions and more than 99% yield is obtained.
Iron-Catalyzed Arylation of Aromatic Ketones and Aldehydes Mediated by Organosilanes
作者:Risto Savela、Marcin Majewski、Reko Leino
DOI:10.1002/ejoc.201402023
日期:2014.7
arylation of aromatic carbonyl compounds is reported. The use of 4 % FeCl3 or Fe(acac)3 as the catalyst, in combination with a slight excess of chlorotrimethylsilane and triethylsilane, chlorination of benzylic ketones and aldehydes with subsequent Friedel–Craftsalkylation of arenes is achieved. Although the method is limited by the general constraints associated with Friedel–Craftsalkylation reactions
Unverbrücke fluorenylkomplexe des typs (C5H5)(9-R-C13H8)ZrCl2 (R Me3Si, alkyl, aryl): synthese, charakterisierung und anwendung als katalysatoren bei der homogenen olefinpolymerisation
作者:Michael A. Schmid、Helmut G. Alt、Wolfgang Milius
DOI:10.1016/s0022-328x(96)06480-7
日期:1996.11
compounds (9-R-C-13H9) (R Me3Si, alkyl, aryl) (1a−i) with butyllithium followed by treatment with (C5H5)ZrCl3 leads to unbridged fluorenyl complexes of the type (C5H5)(9-R-C13H8)ZrCl2. In combination with methylaluminoxane, complexes 2a−i show at high catalytic activity as homogeneous ethylene polymerization catalysts. Compounds 2c (R 1Pr), 2d (R = cyclohexyl), and 2e (R 1Bu) were characterized
各种9-取代的芴化合物(9-RC- 13 H 9)(RMe 3 Si,烷基,芳基)(1a-i)与丁基锂反应,然后用(C 5 H 5)ZrCl 3处理(C 5 H 5)(9-RC 13 H 8)ZrCl 2类型的未桥接芴基配合物。与甲基铝氧烷组合使用时,配合物2a-i作为均相乙烯聚合催化剂具有较高的催化活性。通过X射线结构分析表征化合物2c(R 1 Pr),2d(R =环己基)和2e(R 1 Bu)。
Singlet Biradical Versus Triplet Biradical/Zwitterion Characteristics in Isomers of C
<sub>6</sub>
−C
<sub>5</sub>
−C
<sub>6</sub>
−C
<sub>7</sub>
−C
<sub>6</sub>
‐Fused Pentacyclic Aromatic Hydrocarbons Revealed through Reactivity Patterns
作者:Cian‐Jhe Zhen、Shu‐Feng Lu、Min‐Hwa Lin、Jay‐Tai Wu、Ito Chao、Chih‐Hsiu Lin
DOI:10.1002/chem.202102781
日期:2021.12
Two isomers of C6−C5−C6−C7−C6 fused pentacyclic aromatic hydrocarbons are imbedded with para- and meta-quinondimethane structural motifs respectively. The two compounds exhibit distinctive reactivity patterns reminiscence of singlet and triplet biradical species. The ground state electronic structures predicted by DFT calculation are also consistent with the observed reactivities.