Interfacial photocrosslinking of polymer particles possessing nucleobase photoreactive groups for hollow/capsule polymer fabrication

2022 ◽  
Author(s):  
Yukiya Kitayama ◽  
Akali Dosaka ◽  
Atsushi Harada
Keyword(s):  
Side Chains ◽  
Polymer Particles ◽  
Hollow Capsule ◽  
First Time

Herein, polystyrene-based particles possessing nucleobases in polymer side chains were prepared and nucleobase groups were applied to the interfacial photocrosslinking as photoreactive groups for the first time for fabricating hollow/capsule particles.

The Total Synthesis of Rhabdastrellic Acid A

2018 ◽  
Author(s):  
Yaroslav Boyko ◽  
Christopher Huck ◽  
David Sarlah
Keyword(s):  
Total Synthesis ◽  
Late Stage ◽  
Cross Coupling ◽  
Side Chains ◽  
General Strategy ◽  
Modular Approach ◽  
Linear Sequence ◽  
Generating Sequence ◽  
First Time

<div>The first total synthesis of rhabdastrellic acid A, a highly cytotoxic isomalabaricane triterpenoid, has been accomplished in a linear sequence of 14 steps from commercial geranylacetone. The prominently strained <i>trans-syn-trans</i>-perhydrobenz[<i>e</i>]indene core characteristic of the isomalabaricanes is efficiently accessed in a selective manner for the first time through a rapid, complexity-generating sequence incorporating a reductive radical polyene cyclization, an unprecedented oxidative Rautenstrauch cycloisomerization, and umpolung 𝛼-substitution of a <i>p</i>-toluenesulfonylhydrazone with in situ reductive transposition. A late-stage cross-coupling in concert with a modular approach to polyunsaturated side chains renders this a general strategy for the synthesis of numerous family members of these synthetically challenging and hitherto inaccessible marine triterpenoids.</div>

Incorporation of alkylthio side chains on benzothiadiazole-based non-fullerene acceptors enables high-performance organic solar cells with over 16% efficiency

2020 ◽  
Vol 8 (44) ◽  
pp. 23239-23247
Author(s):  
Andy Man Hong Cheung ◽  
Han Yu ◽  
Siwei Luo ◽  
Zhen Wang ◽  
Zhenyu Qi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Organic Solar Cells ◽  
High Performance ◽  
Power Conversion ◽  
Side Chains ◽  
First Time

This is the first time alkylthio chains are employed on Y6-like NFAs to achieve organic solar cells of power conversion efficiency higher than 16%.

The amino side chains do matter: chemoselectivity in the one-pot three-component synthesis of 2-amino-4H-chromenes by supramolecular catalysis with amino-appended β-cyclodextrins (ACDs) in water

2016 ◽  
Vol 6 (12) ◽  
pp. 4283-4293 ◽  
Author(s):  
Yufeng Ren ◽  
Bo Yang ◽  
Xiali Liao
Keyword(s):  
Side Chains ◽  
One Pot ◽  
Supramolecular Catalysis ◽  
The One ◽  
First Time

The one-pot three-component synthesis of 2-amino-4H-chromenes was accomplished by supramolecular catalysis with well-designed amino-appended β-cyclodextrins (ACDs) in water, while the key role of amino side chains in chemoselectivity was determined for the first time.

scholarly journals Unravelling Main- and Side-Chain Motions in Polymers with NMR Spectroscopy and Relaxometry: The Case of Polyvinyl Butyral

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2686
Author(s):  
Lucia Calucci ◽  
Silvia Pizzanelli ◽  
Alessandro Mandoli ◽  
Artur Birczyński ◽  
Zdzisław T. Lalowicz ◽  
...  
Keyword(s):  
Glass Transition ◽  
Nmr Spectroscopy ◽  
Main Chain ◽  
Amorphous Polymer ◽  
Polyvinyl Butyral ◽  
Side Chains ◽  
Nmr Relaxometry ◽  
Field Cycling ◽  
Nmr Methods ◽  
First Time

Polyvinyl butyral (PVB) is an amorphous polymer employed in many technological applications. In order to highlight the relationships between macroscopic properties and dynamics at a microscopic level, motions of the main-chain and of the propyl side-chains were investigated between Tg − 288 °C and Tg + 55 °C, with Tg indicating the glass transition temperature. To this aim, a combination of solid state Nuclear Magnetic Resonance (NMR) methods was applied to two purposely synthesized PVB isotopomers: one fully protonated and the other perdeuterated on the side-chains. 1H time domain NMR and 1H field cycling NMR relaxometry experiments, performed across and above Tg, revealed that the dynamics of the main-chain corresponds to the α-relaxation associated to the glass transition, which was previously characterized by dielectric spectroscopy. A faster secondary relaxation was observed for the first time and ascribed to side-chains. The geometry and rate of motions of the different groups in the side-chains were characterized below Tg by 2H NMR spectroscopy.

Reactions of Carbenes with Unsaturated Polymers

1967 ◽  
Vol 40 (3) ◽  
pp. 934-935 ◽  
Author(s):  
M. S. Lishanskii ◽  
V. A. Tsitokhtsev ◽  
N. D. Vinogradova
Keyword(s):  
Ethyl Ester ◽  
Trichloroacetic Acid ◽  
Main Chain ◽  
Sodium Methylate ◽  
Side Chains ◽  
Copper Salts ◽  
Chain Reactions ◽  
Decomposition Reactions ◽  
Polar Substituents ◽  
First Time

Abstract The literature has a limited amount of data on chain reactions of unsaturated polymers, in particular diene polymers. The appearance of a paper dealing with addition of dichlorocarbene to polyisoprene and to polybutadiene has impelled us to publish results of studies we made on reactions of unsaturated polymers with carbenes, which have made it possible for the first time to obtain polymers containing in the main chain, or in the side chains, cyclopropane groups with polar substituents. Addition of carbenes to cis-1, 4-polyisoprene, trans-1, 4-polyisoprene, 1, 4-polybutadiene, and 1, 2-polybutadiene was accomplished through decomposition reactions of diazoacetic esters catalyzed by copper salts (for carbethoxycarbene and carbomethoxycarbene) and the reaction of the ethyl ester of trichloroacetic acid with sodium methylate (for dichlorocarbene).

Synthesis and properties of highly branched sulfonated poly(arylene ether)s with flexible alkylsulfonated side chains as proton exchange membranes

2016 ◽  
Vol 4 (6) ◽  
pp. 1326-1335 ◽  
Author(s):  
Dong Liu ◽  
Dan Tao ◽  
Jiangpeng Ni ◽  
Xiongzhi Xiang ◽  
Lei Wang ◽  
...  
Keyword(s):  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Side Chains ◽  
Arylene Ether ◽  
First Time ◽  
Sulfonated Poly

A series of highly branched sulfonated poly(arylene ether)s with flexible alkylsulfonated side chains as proton exchange membranes were synthesized for the first time.

Synthesis and LCST-type phase behavior of water-soluble polypeptide with Y-shaped and charged side-chains

2016 ◽  
Vol 7 (10) ◽  
pp. 1922-1930 ◽  
Author(s):  
Yanzhi Xu ◽  
Mengxiang Zhu ◽  
Minjie Li ◽  
Ying Ling ◽  
Haoyu Tang
Keyword(s):  
Phase Behavior ◽  
Water Soluble ◽  
Side Chains ◽  
Synthetic Route ◽  
Type Phase ◽  
Phase Behaviors ◽  
First Time

Water-soluble thermoresponsive polypeptides with LCST-type phase behaviors bearing Y-shaped and charged side-chains have been reported for the first time by a multi-step synthetic route.

The Total Synthesis of Rhabdastrellic Acid A

2018 ◽  
Author(s):  
Yaroslav Boyko ◽  
Christopher Huck ◽  
David Sarlah
Keyword(s):  
Total Synthesis ◽  
Late Stage ◽  
Cross Coupling ◽  
Side Chains ◽  
General Strategy ◽  
Modular Approach ◽  
Linear Sequence ◽  
Generating Sequence ◽  
First Time

<div>The first total synthesis of rhabdastrellic acid A, a highly cytotoxic isomalabaricane triterpenoid, has been accomplished in a linear sequence of 14 steps from commercial geranylacetone. The prominently strained <i>trans-syn-trans</i>-perhydrobenz[<i>e</i>]indene core characteristic of the isomalabaricanes is efficiently accessed in a selective manner for the first time through a rapid, complexity-generating sequence incorporating a reductive radical polyene cyclization, an unprecedented oxidative Rautenstrauch cycloisomerization, and umpolung 𝛼-substitution of a <i>p</i>-toluenesulfonylhydrazone with in situ reductive transposition. A late-stage cross-coupling in concert with a modular approach to polyunsaturated side chains renders this a general strategy for the synthesis of numerous family members of these synthetically challenging and hitherto inaccessible marine triterpenoids.</div>

Gas-Generating Polymer Particles: Reducing the Decomposition Temperature of Poly(tert-Butyl Methacrylate) Side Chains Using an Encapsulated Acid Catalyst Approach

2020 ◽  
Vol 2 (11) ◽  
pp. 5179-5187
Author(s):  
Ibrahim Eryazici ◽  
Matthew C. D. Carter ◽  
Wesley Sattler ◽  
Jian Yang ◽  
Scott Wills ◽  
...  
Keyword(s):  
Acid Catalyst ◽  
Decomposition Temperature ◽  
Butyl Methacrylate ◽  
Side Chains ◽  
Polymer Particles ◽  
Tert Butyl

Concluding remarks

1967 ◽  
Vol 167 (1009) ◽  
pp. 448-448 ◽  
Keyword(s):  
Dielectric Constant ◽  
Catalytic Activity ◽  
Active Sites ◽  
Low Dielectric Constant ◽  
Side Chains ◽  
Polar Medium ◽  
Active Centre ◽  
Low Dielectric ◽  
Globin Chains ◽  
First Time

For the first time we have been able to interpret the catalytic activity of an enzyme in stereochemical terms. It seems rash to generalize from the structure of one enzyme, but we may broaden our base by elevating myoglobin and haemoglobin to the rank of honorary enzymes, as Monod has suggested, and call the haem groups their active sites. What these three proteins have in common is the distribution of polar and nonpolar side chains; the interior of the lysozyme as well as that of the globin chains is made up largely of hydrocarbons, providing a medium of low dielectric constant. In each case the active centre lies in a pocket formed by this non-polar medium, and the pocket contains some polar residues which are essential for activity.

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