188403-43-2Relevant academic research and scientific papers
Immobilization of quaternized polymers on bacterial cellulose by different grafting techniques
Ramar,Jana, Sourita,Chatterjee, Sandipan,Jaisankar, Sellamuthu N.,Samanta, Debasis
, p. 15935 - 15945 (2019)
Since the discovery of the extraordinary mechanical properties of pristine bacterial cellulose (BC) few decades ago, its potential applications as a textile material and leather-like material have been realized. Immobilization of suitable polymers on the surface of BC can provide two of the most desirable characteristics in the current scenario: improved mechanical strength and variable hydrophobicity. Here, we report the immobilization of suitable polymers on BC surfaces in convenient ways. Different polymers (phosphonium-based or pyridinium-based), different grafting techniques (graft to or direct graft) and different surfaces (bacterial cellulose (BC) or bacterial cellulose-cotton composites (BCC)) were particularly used for comparison. These polymer-functionalized surfaces were characterized by standard instrumentation techniques. Significant improvements in mechanical properties and hydrophobicity were observed for some of the materials after functionalization with the polymers.
Toward dendrimers with cylindrical shape in solution
Karakaya, Birol,Claussen, Wilhelm,Gessler, Katrin,Saenger, Wolfram,Schlüter, A.-Dieter
, p. 3296 - 3301 (1997)
Three approaches for the synthesis of dendrimers with poly(p-phenylene)-PPP derived cores are described. The respective limitations of these approaches are assessed in view of the goal of this research: to make available structurally perfect, high molecul
Design and Development of a Chemical Probe for Pseudokinase Ca2+/calmodulin-Dependent Ser/Thr Kinase
Aydogan, Yagmur,Berger, Benedict-Tilman,Chaikuad, Apirat,Drewry, David H.,Knapp, Stefan,Müller, Susanne,Mandel, Sebastian,Mauer, Sandy,Pohl, Christian,Russ, Nadine,Schr?der, Martin
, p. 14358 - 14376 (2021/10/12)
CASK (Ca2+/calmodulin-dependent Ser/Thr kinase) is a member of the MAGUK (membrane-associated guanylate kinase) family that functions as neurexin kinases with roles implicated in neuronal synapses and trafficking. The lack of a canonical DFG motif, which
Synthesis of Optically Active, X-Shaped, Conjugated Compounds and Dendrimers Based on Planar Chiral [2.2]Paracyclophane, Leading to Highly Emissive Circularly Polarized Luminescence
Gon, Masayuki,Morisaki, Yasuhiro,Sawada, Risa,Chujo, Yoshiki
supporting information, p. 2291 - 2298 (2016/02/18)
Optically active, Fréchet-type dendrimers containing an emissive X-shaped π-electron system as the core unit were synthesized. Gram-scale optical resolution and transformations of 4,7,12,15-tetrasubstituted [2.2]paracyclophanes were also carried out. The high-generation dendrons effectively absorbed UV light and transferred energy to the core, resulting in high photoluminescence (PL) from the core. In addition, the dendrons sufficiently isolated the emissive X-shaped conjugated core and bright emission was observed from both thin films and solutions. Intense circularly polarized luminescence (CPL) was observed from the thin film. The dendrimer films exhibited excellent optical properties, such as large molar extinction coefficients, high fluorescence quantum efficiencies, intense PL and CPL, and large CPL dissymmetry factors.
X-Ray structure determinations of bromo and/or bromomethylsubstituted benzenes: C-H···Br, C-Br···Br, and C-Br···p interactions
Jones, Peter G.,Kus, Piotr,Dix, Ina
, p. 1273 - 1281 (2013/02/23)
The structures of seven benzene derivatives [1,2,3-tri(bromomethyl)benzene, (1); 3,5-di(bromomethyl)bromobenzene, (2); 2,5-di(bromomethyl)bromobenzene, (3); 4-(bromomethyl)-2,5-dibromotoluene, (4); 4-(bromomethyl)bromobenzene, (5); 2,3-di(bromomethyl)bromobenzene, (6) and (bromomethyl)-p-dibromobenzene, (7)] with bromo and bromomethyl (and in one case methyl) substituents are presented and analysed in terms of Br···Br interactions up to 4.0 A , supported by hydrogen bonds H···Br. Some interactions of the type Br···π and π·· · π are encountered and play a subordinate role in the packing. Despite the close chemical similarity of the compounds, some of which are isomers with permuted substituent positions, the packing motifs are highly variable. Compounds 2-5 are based on layer structures with Brn (n=3, 4) and/or mixed Br/C rings. Compounds 1, 6 and 7 display three-dimensional packings of differing complexity, but with interpretable substructures; 1 can be analysed in terms of ribbons of linked Br3 and Br4 rings; 6 displays chains of linked Br3 triangles; 7 consists of ribbons of linked Br4 quadrilaterals.
An improved method for the regiospecific synthesis of polysubstituted [2.2]paracyclophanes
Chow, Hak-Fun,Low, Kam-Hung,Wong, King Y.
, p. 2130 - 2134 (2007/10/03)
4,16-Disubstituted, 4,7,12,15-tetrasubstituted, 4,8,12,16-tetrasubstituted and 4,5,7,8,12,13,15,16-octasubstituted [2.2]paracyclophanes can be prepared in significantly improved yields and excellent regiospecificities via the Winberg 1,6-elimination-dimerization reaction from substituted (4-methylbenzyl) trimethylammonium hydroxides. Using 2-chloro-phenothiazine instead of phenothiazine as a polymerization inhibitor results in a doubling of product yields. Georg Thieme Verlag Stuttgart.
