Polar‐Group Activated Isospecific Coordination Polymerization of ortho ‐Methoxystyrene: Effects of Central Metals and Ligands

2019 ◽  
Vol 25 (8) ◽  
pp. 2043-2050 ◽  
Author(s):  
Yunjie Chai ◽  
Lingfang Wang ◽  
Dongtao Liu ◽  
Zichuan Wang ◽  
Mingtao Run ◽  
...  
Keyword(s):  
Polar Group ◽  
Coordination Polymerization

Crystal Structure Determination of Glycerol-Containing Lipids from Electron Diffraction Data. Use of Analog Compounds Based upon Configurational Isomers of Cyclopentane-1, 2, 3-TRIOL

1977 ◽  
Vol 35 ◽  
pp. 24-25
Author(s):  
Douglas L. Dorset ◽  
Anthony J. Hancock
Keyword(s):  
Crystal Structure ◽  
Electron Diffraction ◽  
Diffraction Data ◽  
Structure Determination ◽  
Crystal Surface ◽  
Coherent Scattering ◽  
Crystal Structure Determination ◽  
Electron Diffraction Data ◽  
Polar Group ◽  
Axis Orientation

Lipids containing long polymethylene chains were among the first compounds subjected to electron diffraction structure analysis. It was only recently realized, however, that various distortions of thin lipid microcrystal plates, e.g. bends, polar group and methyl end plane disorders, etc. (1-3), restrict coherent scattering to the methylene subcell alone, particularly if undistorted molecular layers have well-defined end planes. Thus, ab initio crystal structure determination on a given single uncharacterized natural lipid using electron diffraction data can only hope to identify the subcell packing and the chain axis orientation with respect to the crystal surface. In lipids based on glycerol, for example, conformations of long chains and polar groups about the C-C bonds of this moiety still would remain unknown.One possible means of surmounting this difficulty is to investigate structural analogs of the material of interest in conjunction with the natural compound itself. Suitable analogs to the glycerol lipids are compounds based on the three configurational isomers of cyclopentane-1,2,3-triol shown in Fig. 1, in which three rotameric forms of the natural glycerol derivatives are fixed by the ring structure (4-7).

Mechanism of the propagation step in the anionic polymerization of styrene

1980 ◽  
Vol 45 (4) ◽  
pp. 1047-1055 ◽  
Author(s):  
Miroslav Kašpar ◽  
Jiří Trekoval
Keyword(s):  
Experimental Data ◽  
Induction Period ◽  
Anionic Polymerization ◽  
Reactive Intermediate ◽  
Coordination Polymerization ◽  
Kinetic Dependence ◽  
Mathematical Solution ◽  
Slow Reaction

The paper is dealing with an investigation of the kinetic dependence of the propagation step in the anionic coordination polymerization of styrene in benzene at 303 K with "living" oligostyryllithium as initiator at the onset of the reaction. A short but distinct induction period was found, indicating a preceding slow reaction leading to the formation of a reactive intermediate, which behaves as the initiator of the reaction. Using results obtained in the first paper of this series, a new mechanism of propagation has been suggested, the mathematical solution of which is correlated with experimental data.

The mechanism of the anionic coordination polymerization of isoprene

1980 ◽  
Vol 45 (9) ◽  
pp. 2391-2399 ◽  
Author(s):  
Miroslav Kašpar ◽  
Jiří Trekoval
Keyword(s):  
Chromatographic Method ◽  
Initial Period ◽  
Reaction Scheme ◽  
Polymerization Kinetics ◽  
Coordination Polymerization ◽  
Initial Concentration ◽  
The Cross ◽  
Gas Chromatographic Method ◽  
Kinetics Of

The polymerization kinetics of isoprene (2-methyl-1,3-butadiene) in benzene with butyllithium as the initiator was investigated by the gas chromatographic method. After completion of the initial period of the reaction, its order with respect to the initial concentration of initiator is negative at the concentrations of the latter between 0.01 and 0.25 mol/l, and positive at higher concentrations. A reaction scheme has been suggested with respect to the "cross" association of butyllithium and of the "living" oligoisoprene.

scholarly journals Loss of phosphoserine polar group asymmetry and inhibition of cholesterol transport in Jurkat cells treated with cholesterylphosphoserine

1998 ◽  
Vol 39 (9) ◽  
pp. 1844-1851
Author(s):  
Federico Cusinato ◽  
Walter Habeler ◽  
Francesca Calderazzo ◽  
Francesca Nardi ◽  
Alessandro Bruni
Keyword(s):  
Jurkat Cells ◽  
Cholesterol Transport ◽  
Polar Group

Adsorption of polybutadienes with polar group terminations on the solid surface. 1. Infrared study at the silica surface

1988 ◽  
Vol 21 (4) ◽  
pp. 1059-1062 ◽  
Author(s):  
Masami Kawaguchi ◽  
Minoru Kawarabayashi ◽  
Nobuo Nagata ◽  
Tadaya Kato ◽  
Akira Yoshioka ◽  
...  
Keyword(s):  
Solid Surface ◽  
Silica Surface ◽  
Polar Group ◽  
Infrared Study

Synthesis of Well-Defined Glycopolymers by π-Allylnickel-Catalyzed Living Coordination Polymerization

2001 ◽  
Vol 34 (13) ◽  
pp. 4294-4295 ◽  
Author(s):  
Jia Wang ◽  
Ikuyoshi Tomita ◽  
Takeshi Endo
Keyword(s):  
Coordination Polymerization

Coordination Polymerization of Metal Azides and Powerful Nitrogen-Rich Ligand toward Primary Explosives with Excellent Energetic Performances

2017 ◽  
Vol 29 (22) ◽  
pp. 9725-9733 ◽  
Author(s):  
Jian-Gang Xu ◽  
Cai Sun ◽  
Ming-Jian Zhang ◽  
Bin-Wen Liu ◽  
Xiao-Zhen Li ◽  
...  
Keyword(s):  
Coordination Polymerization ◽  
Powerful Nitrogen

scholarly journals Synthesis and Polymerization of Macromonomer Having a Phospholipid Polar Group

2000 ◽  
Vol 32 (4) ◽  
pp. 378-380 ◽  
Author(s):  
Tsutomu Oishi ◽  
Hirohito Yamasaki ◽  
Hiromi Kada ◽  
Kenjiro Onimura ◽  
Hiromori Tsutsumi ◽  
...  
Keyword(s):  
Polar Group
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