[EN] BLACK DICHROIC DYE<br/>[FR] COLORANT DICHROÏQUE NOIR
申请人:BASF SE
公开号:WO2011157614A1
公开(公告)日:2011-12-22
Described is a black dichroic dye composition comprising 2 or more dyes, wherein at least one dye, generally a red dye and optionally a yellow dye, conforms to the formula A and at least one dye, usually a blue dye, conforms to the formula B Ar1-N=N-[Ar2-N=N-]qAr3-N=N-Ar4 (B) with symbols as defined in present claims. The dye composition is well suited for combination with liquid crystal material for use, inter alia, as polarizing film and/or in liquid crystal displays, showing, inter alia, high dichroic ratio and excellent compatibility with the LC material.
A series of six new, highly soluble N,N′-dialkylated isoindigo derivatives bearing different electron donating thiophene units at the 6,6′-positions were synthesized by Stille cross-coupling reaction. The optical and electrochemical properties of these dyes were studied by UV-vis spectroscopy and cyclic voltammetry, revealing a good tunability of their electronic properties by peripheral substituents with amino groups leading to strong absorption reaching the NIR region. The DFT calculations of the frontier molecular orbitals of these dyes corroborate the observed substituent effect on absorption and redox properties.
Catalytic thienylcarbene-transfer reactions have been developed. The rhodium-catalyzed reaction of alkenes, furans, and thiophenes with a thiocarbamoyl-ene-yne compound as a carbene source gave the cyclopropanation products or ring-opened products of heterocycles. These processes provide efficient synthetic methods for thiophene-containing complex molecules.
Analysis of the Palladium-Catalyzed (Aromatic)C–H Bond Metalation–Deprotonation Mechanism Spanning the Entire Spectrum of Arenes
作者:Serge I. Gorelsky、David Lapointe、Keith Fagnou
DOI:10.1021/jo202342q
日期:2012.1.6
intermediates and the analysis of bonding interactions in TS structures. The effects of remote C2 substituents on the reactivity of thiophenes were evaluated computationally and were corroborated experimentally with competition studies. We show that nucleophilicity of thiophenes, evaluated by Hammett σp parameters, correlates with each of the distortion–interaction parameters. In the final part of this manuscript
Synthesis and Computational Study of Semicroconaines and Nonsymmetric Croconaines
作者:Maria Annunziata M. Capozzi、Angela Punzi、Francesco Babudri、Roberta Musio、Gianluca M. Farinola
DOI:10.1021/acs.joc.8b01930
日期:2018.12.7
The synthesis of two new dye families of croconic acid derivatives, semicroconaine and nonsymmetric croconaine dyes, is reported for the first time. These compounds show strong absorption in the UV–visible and NIR, respectively. Semicroconaine dyes were obtained by a scalable and efficient condensation of croconic acid with aromaticheterocyclic methylene-active compounds. The subsequent reaction of