Amine–imine palladium catalysts for living polymerization of ethylene and copolymerization of ethylene with methyl acrylate: incorporation of acrylate units into the main chain and branch end

2016 ◽  
Vol 7 (3) ◽  
pp. 529-537 ◽  
Author(s):  
Haibin Hu ◽  
Darui Chen ◽  
Haiyang Gao ◽  
Liu Zhong ◽  
Qing Wu
Keyword(s):  
Methyl Acrylate ◽  
Palladium Catalyst ◽  
Palladium Catalysts ◽  
Main Chain ◽  
Living Polymerization ◽  
Branched Copolymers

A bulky amine–imine palladium catalyst can polymerize ethylene in a living fashion. Copolymerizations of ethylene and methyl acrylate afford branched copolymers with terminal and main chain acrylate units.

Highly 2,3-Selective and Fast Living Polymerization of Alkyl-, Alkoxy- and Phenylallene Using Nickel(II) Catalysts

2021 ◽  
Author(s):  
Shu-Ming Kang ◽  
Xun-Hui Xu ◽  
Lei Xu ◽  
Li Zhou ◽  
Na Liu ◽  
...  
Keyword(s):  
Main Chain ◽  
Functional Materials ◽  
Living Polymerization ◽  
Facile Synthesis

Polyallene is one of the most attractive synthetic precursors for constructing functional materials due to its unsaturated bonds on the main chain or pendants. Facile synthesis of high regioselectivity polyallenes...

Substituent Effects of the Backbone in α-Diimine Palladium Catalysts on Homo- and Copolymerization of Ethylene with Methyl Acrylate

2012 ◽  
Vol 31 (17) ◽  
pp. 6054-6062 ◽  
Author(s):  
Lihua Guo ◽  
Haiyang Gao ◽  
Qirui Guan ◽  
Haibin Hu ◽  
Juean Deng ◽  
...  
Keyword(s):  
Methyl Acrylate ◽  
Palladium Catalysts ◽  
Substituent Effects

scholarly journals C–H arylations of 1,2,3-triazoles by reusable heterogeneous palladium catalysts in biomass-derived γ-valerolactone

2016 ◽  
Vol 52 (63) ◽  
pp. 9777-9780 ◽  
Author(s):  
Xu Tian ◽  
Fanzhi Yang ◽  
Dace Rasina ◽  
Michaela Bauer ◽  
Svenja Warratz ◽  
...  
Keyword(s):  
Palladium Catalyst ◽  
Palladium Catalysts ◽  
Reaction Medium ◽  
Environmentally Benign ◽  
User Friendly ◽  
Heterogeneous Palladium Catalyst

C–H arylations were accomplished with a user-friendly heterogeneous palladium catalyst in the biomass-derived γ-valerolactone (GVL) as an environmentally-benign reaction medium.

scholarly journals Synergistic Palladium-Phosphoric Acid Catalysis in (3 + 2) Cycloaddition Reactions between Vinylcyclopropanes and Imines

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 150 ◽  
Author(s):  
Vasco Corti ◽  
Enrico Marcantonio ◽  
Martina Mamone ◽  
Alessandro Giungi ◽  
Mariafrancesca Fochi ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Palladium Catalyst ◽  
Palladium Catalysts ◽  
Acid Catalysis ◽  
Cycloaddition Reaction ◽  
Cross Coupling ◽  
Cycloaddition Reactions ◽  
Synergistic Catalysis ◽  
Palladium Catalyzed ◽  
First Time

The palladium-catalyzed (3 + 2) cycloaddition reaction between vinylcyclopropanes (VCPs) bearing geminal EWG’s and imines represents a straightforward and flexible entry to polysubstituted pyrrolidine derivatives. In this paper, we demonstrate that using a synergistic catalysis approach, based on the combination of phosphoric acid and palladium catalysts, it is possible to engage for the first time N-aryl and N-benzyl imines in this cycloaddition reaction. A range of polysubstituted pyrrolidines is obtained with moderate to good yields and diastereoselectivities, using a simple palladium species (Pd(PPh3)4) and an archetypical phosphoric acid as catalyst combination. A two-step scheme which exploits the same palladium catalyst for two consecutive and mechanistically distinct reactions (the cycloaddition and a Suzuki–Miyaura cross-coupling) is also presented. This synergistic catalysis approach is well posited for the development of the enantioselective version of this reaction. A screening of common BINOL-derived chiral phosphoric acids as catalyst component identified a species giving the product with moderate, yet promising, enantioselectivity (64% ee).

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