Direct C3‐Arylation of 2 H‐Indazole Derivatives with Aryl Bromides by using Low Loading of a Phosphine‐free Palladium Catalyst
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DOI: 10.1002/cctc.201601420
Abstract: The palladium‐catalyzed direct arylation of 2 H‐indazoles with aryl bromides for the preparation of 3‐aryl‐2 H‐indazoles was found to proceed in high yields when using only 0.5–0.1 mol % Pd(OAc)2 catalyst and KOAc as inexpensive base. A wide variety… read more here.
Keywords: direct arylation; aryl bromides; electron; palladium ... See more keywords
Direct Arylation Polycondensation (DAP) Synthesis of Alternating Quaterthiophene-Benzothiadiazole Copolymers for Organic Solar Cell Applications.
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DOI: 10.1002/cplu.201900260
Abstract: Poly[(2,1,3-benzothiadiazole-4,7-diyl)-alt-4',3''-difluoro-3,3'''-di(2-octyldodecyl)-2,2';5',2'';5'',2'''-quaterthiophene-5,5'''-diyl)] (PBTff4T-2OD) and poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-3,3'''-di(2-octyldodecyl)-2,2';5',2'';5'',2'''-quaterthiophene-5,5'''-diyl)] (PffBT4T-2OD) for use as the p-donor component of high-efficiency fullerene-based organic solar cells are usually synthesized in established C-C cross-coupling reactions, preferably using the Stille procedure. This report describes how PBTff4T-2OD… read more here.
Keywords: diyl; dap; direct arylation; arylation polycondensation ... See more keywords
Chemoselective Palladium‐Catalyzed Direct C–H Arylation of 5‐Carboxyimidazoles: Unparalleled Access to Fused Imidazole‐Based Tricycles Containing Six‐, Seven‐ or Eight‐Membered Rings
Sign Up to like & getrecommendations! Published in 2017 at "European Journal of Organic Chemistry"
DOI: 10.1002/ejoc.201700297
Abstract: An extensive study of the chemoselective Pd-catalyzed inter- and intramolecular direct C–H arylation of N-benzylated 5-carboxyimidazoles with halides with and without CuI assistance in 1,4-dioxane as a low-polarity solvent was explored. The method was suitable… read more here.
Keywords: direct arylation; membered rings; fused imidazole; eight membered ... See more keywords
A Defect-Free Naphthalene Diimide Bithiazole Copolymer via Regioselective Direct Arylation Polycondensation
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DOI: 10.1002/ejoc.201800821
Abstract: An optimized direct arylation polycondensation (DAP) protocol for the synthesis of a novel naphthalene diimide (NDI) 2,2'-bithiazole (2-BTz) copolymer (PNDI-2-BTz) is presented. The regioselective C-H activation of 2-BTz at the 5-positions allows for the synthesis… read more here.
Keywords: direct arylation; arylation polycondensation; naphthalene diimide; btz ... See more keywords
Over 7% photovoltaic efficiency of a semicrystalline donor-acceptor polymer synthesized via direct arylation polymerization
Sign Up to like & getrecommendations! Published in 2018 at "Dyes and Pigments"
DOI: 10.1016/j.dyepig.2018.05.036
Abstract: Abstract Direct arylation polymerization enables “greener” synthesis of a high-performance semicrystalline π-conjugated polymer, poly[(2,5-bis(2-hexyldecyloxy)phenylene)-alt-(5,6-difluoro-4,7-di(thiophene-2-yl)benzo[c][1,2,5]thiadiazole) (PPDT2FBT). The resulting polymers show a hole mobility of 4.7 × 10−3 cm2 V−1 s−1 in bottom-gate/top-contact field effect transistors, and a power conversion efficiency over… read more here.
Keywords: direct arylation; semicrystalline; arylation polymerization; polymer ... See more keywords
New 4-vinylbenzyl-substituted bis(NHC)-Pd(II) complexes: Synthesis, characterization and the catalytic activity in the direct arylation reaction
Sign Up to like & getrecommendations! Published in 2018 at "Inorganica Chimica Acta"
DOI: 10.1016/j.ica.2017.12.019
Abstract: Abstract This study contains the synthesis of the new 4-vinylbenzyl substituted bis(NHC)-Pd(II) complexes and their catalytic activity in direct arylation reaction. The bis(NHC)-Pd(II) complexes have been prepared from Ag(I)NHC complexes by transmetallation method. The complexes… read more here.
Keywords: direct arylation; bis nhc; arylation reaction; nhc complexes ... See more keywords
The direct C4-arylation of 3,5-dimethylisoxazole with aryl bromides catalyzed by imidazolidin-2-ylidene based palladium-PEPPSI complexes
Sign Up to like & getrecommendations! Published in 2020 at "Inorganica Chimica Acta"
DOI: 10.1016/j.ica.2020.119454
Abstract: Abstract In this study, the synthesis and characterization of four new imidazolinium salts as carbene precursors and their corresponding four new PEPPSI-type (PEPPSI = Pyridine Enhanced Precatalyst Preparation Stabilization and Initiation) palladium complexes were reported. The structures… read more here.
Keywords: direct arylation; peppsi; aryl bromides; arylation dimethylisoxazole ... See more keywords
Eco-friendly synthesis of regioregular poly(3-hexylthiophene) by direct arylation polymerization: Analysis of the properties that determine its performance in BHJ solar cells
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DOI: 10.1016/j.polymer.2020.122348
Abstract: Abstract A series of regioregular poly(3-hexylthiophenes) (rr-P3HTs) was synthetized by optimizing an eco-friendly Direct Arylation Polymerization (DArP) method, using as novel strategy, a gradual catalyst addition and temperature reaction increase improving P3HT quality. The polymers… read more here.
Keywords: direct arylation; arylation polymerization; eco friendly; regioregular poly ... See more keywords
Facile access to conjugated polymers under aerobic conditions via Pd-Catalyzed direct arylation and aryl amination polycondensation
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DOI: 10.1016/j.polymer.2020.122927
Abstract: Abstract Facile polymerization reaction conditions were developed for synthesizing conjugated polymers via direct arylation and the Buchwald-Hartwig aryl amination reactions under aerobic conditions. Refluxing the reaction solvent and using XPhos Pd G2 as a precatalyst… read more here.
Keywords: direct arylation; polycondensation; aryl amination; conjugated polymers ... See more keywords
Palladium-catalyzed direct arylation of maleimides: A simple route to bisaryl-substituted maleimides
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DOI: 10.1016/j.tet.2017.01.069
Abstract: Palladium-catalyzed direct arylation of maleimides via Heck as well as organoboron-mediated Heck-type reactions are developed. These methods offer an approach to a wide variety of biologically interesting 3,4-diarylmaleimide scaffolds from readily accessible starting materials. These… read more here.
Keywords: direct arylation; substituted maleimides; bisaryl substituted; palladium catalyzed ... See more keywords
Suppressing Defect Formation Pathways in the Direct C–H Arylation Polymerization of Photovoltaic Copolymers
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DOI: 10.1021/acs.macromol.8b02297
Abstract: Direct C–H arylation polymerization (DARP) holds great promise for the green, atom-efficient synthesis of π-conjugated copolymers for use in high-performance polymer solar cells (PSCs). However, C–H arylation regioselectivity control for monomers containing multiple reactive aryl… read more here.
Keywords: direct arylation; arylation polymerization; formation; arylation ... See more keywords