62191-56-4Relevant academic research and scientific papers
Implementing liquid-crystalline properties in single-stranded dinuclear lanthanide helicates
Terazzi, Emmanuel,Zaim, Amir,Bocquet, Bernard,Varin, Johan,Guenee, Laure,Dutronc, Thibault,Lemonnier, Jean-Francois,Floquet, Sebastien,Cadot, Emmanuel,Heinrich, Benoit,Donnio, Bertrand,Piguet, Claude
supporting information, p. 3323 - 3333 (2013/07/26)
The connection of flexible protodendritic wedges to the bis-tridentate rigid polyaromatic ligand L1 provides amphiphilic receptors L5 and L6; their reduced affinities for complexing trivalent lanthanides (Ln = La, Y, Lu) in organic solvent (by fifteen orders of magnitude!) prevent the formation of the expected dinuclear triple-stranded helicates [Ln2(Lk) 3]6+. This limitation could be turned into an advantage because L1 or L6 can be treated with [Ln(hfac)3] (Hhfac = 1,1,1,5,5,5-hexafluoro-2,4-pentanedione) to give neutral single-stranded [Ln2(Lk)(hfac)6] complexes with no trace of higher-order helicates. Whereas ligands L1 and L5 are not liquid crystals, L6 can be melted above room temperature (41°C) to give a nematic mesophase, and its associated dinuclear helical complex [Y2(L6)(hfac)6] self-organises at the same temperature into a fluidic smectic mesophase. The lipophilic dendritic ligand L6 selectively reacts with trivalent yttrium hexafluoroacetylacetonate (hfac) to give the liquid-crystalline single-stranded dinuclear helicate [Y2(L6)(hfac)6], which self-organises into an SmA mesophase. Copyright
Hyperbranched poly(aryl ester)s as developer materials for thermal printing system
Jang, Yeon-Im,Choi, Won-Ho,An, Byeong-Kwan
, p. 1225 - 1231 (2013/07/28)
A novel class of hyperbranched polyesters, HPpEP and HPmEP, were prepared via a facile one-pot polymerization of a phloroglucinol (as a B3 monomer) with a phthaloyl dichloride (as an A2 monomer) for replacing a problematic BPA developer in thermal printing system. The resulting polymers, HPpEP and HPmEP, had highly branched structures and met well the requirements for high performance developer materials such as colorlessness, easy and inexpensive synthesis, high thermal stability, etc. In addition, these polymers exhibited an efficient reaction with leuco dyes (ODB-2) for a coloring process by releasing protons from linear and terminal phenol groups of polymers when heated.
Heterolithic azobenzene-containing supermolecular tripedal liquid crystals self-organizing into highly segregated bilayered smectic phases
Nagy, Zsuzsanna T.,Heinrich, Benoit,Guillon, Daniel,Tomczyk, Jaroslaw,Stumpe, Joachim,Donnio, Bertrand
supporting information; experimental part, p. 18614 - 18622 (2012/10/08)
Synthesis, self-organization, and optical properties of supermolecular tripedal liquid crystals incorporating various prototypical mesogenic units such as alkoxy-azobenzene (AZB), alkoxy-biphenylene (BPH) or alkoxy-cyanobiphenyl (OCB) derivatives are repo
Effect of guest molecule flexibility in access to dendritic interiors
Aathimanikandan, Sivakumar V.,Sandanaraj, Britto S.,Arges, Christopher G.,Bardeen, Christopher J.,Thayumanavan
, p. 2809 - 2812 (2007/10/03)
(Figure Presented) Dendrimers are attractive scaffolds for catalysis, since catalytic sites can be isolated and the catalysts are recoverable and reusable. Herein, we show that conformationally constrained molecules have better access to dendritic cores c
The first total synthesis and neurotrophic activity of clusiparalicoline A, a prenylated and geranylated biaryl from Clusia paralicola
Takaoka, Shigeki,Nakade, Kousuke,Fukuyama, Yoshiyasu
, p. 6919 - 6923 (2007/10/03)
The first synthesis of clusiparalicoline A, a prenylated and geranylated biphenyl compound isolated from the roots of Clusia paralicola, has been achieved by applying the sequential palladium-catalyzed Stille and Suzuki reactions to the formation of all t
Process for the autoxidation of an isopropylphenyl ester
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, (2008/06/13)
Isopropylphenyl esters are converted to di- or trihydric phenols via a novel autoxidation of the esters at high conversion rates to the corresponding hydroperoxyisopropylphenyl esters in the presence of a catalyst combination comprising at least two members selected from the group consisting of (i) a metal phthalocyanine; (ii) a di-tertiary alkyl peroxide; and (iii) a tertiary alkyl hydroperoxide. Rearrangement of the hydroperoxyisopropylphenyl esters to the corresponding hydroxyphenyl esters and the hydrolysis of the latter compounds provides the phenols in overall yields (from the starting esters) heretofore not obtainable. Novel bis(hydroperoxyisopropylphenyl)carbonates are described which are attractive intermediates for the intermediate bisphenol carbonate or the final hydroquinone hydrolysis product.
