Visible and sunlight driven RAFT photopolymerization accelerated by amines: kinetics and mechanism

2016 ◽  
Vol 7 (43) ◽  
pp. 6626-6636 ◽  
Author(s):  
Michael L. Allegrezza ◽  
Zachary M. DeMartini ◽  
Alex J. Kloster ◽  
Zachary A. Digby ◽  
Dominik Konkolewicz
Keyword(s):  
Block Copolymers ◽  
Visible Light ◽  
Raft Polymerization ◽  
Kinetics And Mechanism ◽  
Tertiary Amines ◽  
Kinetics Of Polymerization ◽  
Kinetics Of

RAFT polymerization using only tertiary amines under visible light or sunlight is studied, to determine the kinetics of polymerization, and the system is applied to various monomers giving well-defined homo and block copolymers.

Facile synthesis of poly(N-vinyl pyrrolidone) block copolymers with “more-activated” monomers by using photoinduced successive RAFT polymerization

2020 ◽  
Vol 11 (12) ◽  
pp. 2080-2088
Author(s):  
Yingjie Wang ◽  
Mengqi Wang ◽  
Liangjiu Bai ◽  
Lifen Zhang ◽  
Zhenping Cheng ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Visible Light ◽  
Room Temperature ◽  
Raft Polymerization ◽  
Vinyl Pyrrolidone ◽  
Facile Synthesis ◽  
Polymerization Method

Well-defined PNVP block copolymers with more-activated monomers were synthesized by a single RAFT polymerization method under irradiation with visible light at room temperature.

Kinetics and mechanism of the reaction of iron(III) with 6-methyl-2,4-heptanedione and 3,5-heptanedione

1990 ◽  
Vol 55 (8) ◽  
pp. 1984-1990 ◽  
Author(s):  
José M. Hernando ◽  
Olimpio Montero ◽  
Carlos Blanco
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Activation Parameters ◽  
Enol Form ◽  
Kinetics And Mechanism ◽  
Kinetic Constants ◽  
Steric Factors ◽  
Kinetics Of ◽  
Mechanism Of The Reaction

The kinetics of the reactions of iron(III) with 6-methyl-2,4-heptanedione and 3,5-heptanedione to form the corresponding monocomplexes have been studied spectrophotometrically in the range 5 °C to 16 °C at I 25 mol l-1 in aqueous solution. In the proposed mechanism for the two complexes, the enol form reacts with the metal ion by parallel acid-independent and inverse-acid paths. The kinetic constants for both pathways have been calculated at five temperatures. Activation parameters have also been calculated. The results are consistent with an associative activation for Fe(H2O)63+ and dissociative activation for Fe(H2O)5(OH)2+. The differences in the results for the complexes of heptanediones studied are interpreted in terms of steric factors.

Catalyst-Free [2,3]-Sigmatropic Rearrangement Reactions of Photochemically Generated Ammonium Ylides

Synthesis ◽  
2019 ◽  
Vol 51 (23) ◽  
pp. 4348-4358 ◽  
Author(s):  
Fang Li ◽  
Feifei He ◽  
Rene M. Koenigs
Keyword(s):  
Visible Light ◽  
Sigmatropic Rearrangement ◽  
Tertiary Amines ◽  
Amino Esters ◽  
Catalyst Free ◽  
Rearrangement Reaction ◽  
Rearrangement Reactions ◽  
Free Ammonium

The rearrangement reaction of ammonium ylides furnishes valuable α,α-disubstituted amino esters. In this work, we describe the visible-light photolysis reaction of aryldiazoacetates in the presence of tertiary amines that react via a free ammonium ylide in a sigmatropic rearrangement reaction to provide amino esters in moderate to very good yields (33 examples, up to 97% yield).

Kinetics of Preferential Adsorption of Amphiphilic Star Block Copolymers that Tether by Their Corona Blocks at the Solid/Fluid Interface

2014 ◽  
Vol 47 (12) ◽  
pp. 4048-4055 ◽  
Author(s):  
Jose Alonzo ◽  
Juan Pablo Hinestrosa ◽  
Jimmy W. Mays ◽  
S. Michael Kilbey
Keyword(s):  
Block Copolymers ◽  
Fluid Interface ◽  
Preferential Adsorption ◽  
Star Block Copolymers ◽  
Kinetics Of
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