Chromatographic materials for the separation of unsaturated molecules
申请人:Waters Technologies Corporation
公开号:US10092894B2
公开(公告)日:2018-10-09
The present disclosure relates to a method of separating a compound of interest, particularly unsaturated compound(s) of interest, from a mixture. The compound is separated using a column having a chromatographic stationary phase material for various different modes of chromatography containing a first substituent and a second substituent. The first substituent minimizes compound retention variation over time under chromatographic conditions. The second substituent chromatographically and selectively retains the compound by incorporating one or more aromatic, polyaromatic, heterocyclic aromatic, or polyheterocyclic aromatic hydrocarbon groups, each group being optionally substituted with an aliphatic group.
(TEMPO)-mediated hydroxyfluoroalkylation of arylamines with polyfluorinated alcohols via a radical-triggered C(sp2)–H/C(sp3)–H dehydrogenative cross-coupling process was developed. This transformation features simple operation, high atom economy, broad substrate compatibility, and excellent regioselectivity, leading to a series of hydroxyfluoroalkylated arylamine derivatives. Importantly, these synthetic
Design and synthesis of squaraine based near infrared fluorescent probes
作者:M.C. Basheer、U. Santhosh、S. Alex、K. George Thomas、Cherumuttathu H. Suresh、Suresh Das
DOI:10.1016/j.tet.2006.12.007
日期:2007.2
A novel class of dialkylanthracene containing squaraine dyes (Sq1-3) possessing intense absorption and emission in the NIR region has been synthesized. Structural and electronic features investigated using DFT methods suggest that the significant bathochromic shifts observed on replacing dialkylaniline by dialkylanthracene in this class of molecules can be attributed to a reduction in the HOMO-LUMO gap mainly due to enhanced hydrogen bonding between the carbonyl group of the cyclobutane ring and the neighboring aromatic hydrogen in the dyes containing the anthracene moiety. The absence of fluorescence in aqueous media and high fluorescence when encapsulated into hydrophobic domains make this class of dyes especially useful as probes for mapping such domains in biological systems. (c) 2007 Elsevier Ltd. All rights reserved.
Saaby, Steen; Fang, Xiangming; Gathergood, Nicholas, Angewandte Chemie - International Edition, 2000, vol. 39, # 22, p. 4114 - 4116
作者:Saaby, Steen、Fang, Xiangming、Gathergood, Nicholas、Joergensen, Karl Anker
DOI:——
日期:——
COMPOSES IONIQUES PERFLUOROVINYLIQUES ET LEUR UTILISATION DANS DES MATERIAUX CONDUCTEURS