3-cyanopyridinium tricyanomethanides as ionic liquids
申请人:Lonza Ltd
公开号:EP2465849A1
公开(公告)日:2012-06-20
Disclosed are 3-cyanopyridinium tricyanomethanides of formula
wherein n is an integer from 2 to 10 and R is hydrogen or -CN, and a process for the preparation thereof. The 3-cyanopyridinium tricyanomethanides are useful e. g. as selective solvents in the separation of alkene-alkane mixtures.
[EN] 3-CYANOPYRIDINIUM TRICYANOMETHANIDES<br/>[FR] TRICYANOMÉTHANIDES DE 3-CYANOPYRIDINIUM
申请人:LONZA AG
公开号:WO2012076367A1
公开(公告)日:2012-06-14
Disclosed are 3-cyanopyridinium tricyanomethanides of formula (I), wherein n is an integer from 2 to 10 and R is hydrogen or -CN, and a process for the preparation thereof. The 3-cyanopyridinium tricyanomethanides are useful e. g. as selective solvents in the separation of alkene-alkane mixtures.
Ionic liquids and their use in extraction processes
申请人:BP p.l.c.
公开号:EP1854786A1
公开(公告)日:2007-11-14
There is provided a process for the extraction of at least one aromatic compound from a mixture with at least one aliphatic hydrocarbon, which process comprises contacting said mixture with a salt that is in a liquid state at a temperature below 150°C, said salt having a cation which comprises an aromatic nitrogen-containing heterocyclic ring system, in which a nitrogen atom forming part of said ring system is quaternised and in which said ring system is substituted by at least one electron-withdrawing substituent. Some of said salts are novel.
Enantioselective Dearomatization of Alkylpyridiniums by <i>N</i>-Heterocyclic Carbene-Catalyzed Nucleophilic Acylation
作者:Graziano Di Carmine、Daniele Ragno、Olga Bortolini、Pier Paolo Giovannini、Andrea Mazzanti、Alessandro Massi、Marco Fogagnolo
DOI:10.1021/acs.joc.7b02996
日期:2018.2.16
A chiral NHC-catalyzed dearomatizing reaction of activated N-alkylpyridinium salts with aliphatic aldehydes is described. The resulting acylated 1,4-dihydropyridines have been obtained with complete C4 regioselectivity and enantioselectivities in the range 52-78% ee. The (4R)-absolute configuration of the synthesized compounds has been determined by the TD-DFT simulation of the electronic circular dichroism spectra.
Asymmetric Dearomative Cascade Multiple Functionalizations of Activated <i>N</i>-Alkylpyridinium and <i>N</i>-Alkylquinolinium Salts
作者:Xue Song、Ru-Jie Yan、Wei Du、Ying-Chun Chen
DOI:10.1021/acs.orglett.0c02828
日期:2020.10.2
An enantioselectivecascadereaction of N-alkylpyridinium and -quinolinium salts with o-hydroxybenzylideneacetones to access fused polyheterocycles through cross dienamine-mediated addition followed by trapping of the dearomatized enamine-type intermediates and aminal formation has been developed. A cascade assembly of N-benzyl-4-methylpyridinium salt and cyclic 2,4-dienones is further disclosed to