Halogen-Free Room-Temperature Brønsted Acidic Ionic Liquid [Hmim]<sup>+</sup> HSO<sub>4</sub> <sup>−</sup> as a Recyclable Green “Dual Reagent” Catalysis for the Synthesis of Triarylmethanes (TRAM<scp>s</scp>)
halogen-free Brønstedacidicionicliquid methylimidazolium hydrogen sulfate ([Hmim]+ HSO4 −) acts as a very efficient catalyst for the one-pot, two-component Baeyer condensation of a variety of aromatic aldehydes with dimethyl or diethyl aniline at room temperature. This “green” reagent behaves as both catalyst and solvent; that is, it exhibits “dual-reagent catalysis.” The room-temperature acidicionic liquid
Synthesis of symmetric triarylmethane derivatives catalyzed by AIL ionic liquid
作者:Li Q. Kang、Han Gao、Yue Q. Cai
DOI:10.1007/s00706-017-2053-2
日期:2018.1
AbstractAn efficient, eco-friendly ionicliquid was described for the synthesis of symmetric triarylmethane derivatives via Baeyer condensation of N,N-dimethylaniline with different active aromatic aldehyde compounds using amide ionicliquid as a catalyst. The syntheses were achieved for the first time using amide ionicliquid as a catalyst eliminating the need for a volatile organic solvent. The advantages
A convenient and practical method for the synthesis of unsymmetrical triarylmethanes was demonstrated through a one-pot three-component double Friedel–Crafts reaction of various aliphatic, aromatic, or heteroaromatic aldehydes with N,N-dialkylanilines and indoles by using a Brønstedacidicionicliquid as the catalyst. This method was successfully applied under metal- and solvent-free conditions at
通过使用布朗斯台德酸性离子液体,各种脂肪族、芳香族或杂芳香族醛与N , N - 二烷基苯胺和吲哚的一锅三组分双傅克反应,证明了一种方便实用的合成不对称三芳基甲烷的方法作为催化剂。该方法在 80 °C 的无金属和无溶剂条件下成功应用,从广泛的底物中以中等至高产率提供了相应的不对称三芳基甲烷产物。此外,通过定量NMR分析研究了该反应的机理。
B(OH)<sub>3</sub>‐Catalyzed Dual Friedel‐Crafts Type Reaction of Anilines and Aldehydes to Access Di‐ or Triarylmethanes (TRAMs)
作者:Yaqoob A. Teli、Reetu Reetu、Raghuram Gujjarappa、Sourav Banerjee、Susanta Ghanta、Mayur Jagdishbhai Patel、Virender Singh、Nabil Al‐Zaqri、Ragini Sengupta、Chandi C. Malakar
DOI:10.1002/ejoc.202301086
日期:2024.2.19
The B(OH)3-catalyzed dual Friedel-Craftstypereaction has been developed to install a tertiary Csp3-center. The efficacy of this process is explored towards the preparation of symmetric and unsymmetric tri-arylmethanes (TRAMs).
Fotochromes System, damit hergestellte Schichten und deren Verwendung
申请人:BASF Aktiengesellschaft
公开号:EP0239868A1
公开(公告)日:1987-10-07
Das fotochrome System, enthält einen oxidierbaren Leukofarbstoff und einen fotochemisch aktivierbaren Initiator, der den Leukofarbstoff in den Farbstoff überführt, wobei der Initiator ein Phenanthroimidazolderivat ist.
Das fotochrome System eignet sich zur Herstellung fotochromer Schichten für Photoresists und Druckplatten.