Functionalized dicyandiamide–formaldehyde polymers as efficient heterogeneous catalysts for conversion of CO2 into organic carbonates

2014 ◽  
Vol 16 (5) ◽  
pp. 2771-2778 ◽  
Author(s):  
Xiang-Lei Meng ◽  
Yi Nie ◽  
Jian Sun ◽  
Wei-Guo Cheng ◽  
Jin-Quan Wang ◽  
...  
Keyword(s):  
High Activity ◽  
Ring Opening ◽  
Heterogeneous Catalysts ◽  
Transesterification Reaction ◽  
Organic Carbonates ◽  
Ring Opening Of Epoxide

The ABMDFP exhibited high activity on cycloaddition of CO2 and transesterification reaction of EC, which was also suitable for various substrates. A possible mechanism of ring-opening of epoxide and activation of CO2 was proposed.

Preparation of functionalized castor oil derivatives with tunable physical properties using heterogeneous acid and base catalysts

RSC Advances ◽  
2015 ◽  
Vol 5 (62) ◽  
pp. 50289-50297 ◽  
Author(s):  
Sivashunmugam Sankaranarayanan ◽  
Kannan Srinivasan
Keyword(s):  
Physical Properties ◽  
Castor Oil ◽  
Ring Opening ◽  
Heterogeneous Catalysts ◽  
Base Catalysts ◽  
Acid And Base ◽  
Oil Derivatives ◽  
Epoxidized Castor Oil

Functionalized castor oil derivatives are achieved from epoxidized castor oil through ring opening and transesterification reactions using heterogeneous catalysts.

The mechanistic duality of (thio)urea organocatalysts for ring-opening polymerization

2019 ◽  
Vol 17 (13) ◽  
pp. 3305-3313 ◽  
Author(s):  
Nayanthara U. Dharmaratne ◽  
Jinal U. Pothupitiya ◽  
Matthew K. Kiesewetter
Keyword(s):  
High Activity ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Precise Control ◽  
New Applications

Dual mechanisms for H-bond mediated ring-opening polymerization allow for precise control, high activity and new applications.

Active Copper Catalyzed Regioselective Ring Opening of Epoxides by Heterocyclic Amines: An Efficient Protocol for Synthesis of β-Amino Alcohols

2019 ◽  
Vol 4 (3) ◽  
pp. 194-199
Author(s):  
Santosh S. Devkate ◽  
Arvind S. Burungale ◽  
Ashok S. Pise ◽  
Sunil D. Jadhav
Keyword(s):  
Natural Products ◽  
Carbon Atom ◽  
Ring Opening ◽  
Amino Alcohols ◽  
Heterocyclic Amines ◽  
Epoxide Ring ◽  
Epoxide Ring Opening ◽  
Ring Opening Of Epoxide ◽  
Ring Opening Of Epoxides

The regioselective epoxide ring opening at less substituted carbon atom of epoxide were reported by nucleophiles like heterocyclic amines which gives well known 1,2-difunctionalized amino alcohols. These are present in many synthetic as well as natural products. The ring opening of epoxide is achieved by cleavage with amines in presence of copper(0) as a catalyst. It is observed that the lithium napthalenide reduction of copper(I) produces a highly reactive form of copper(0) that acts as a catalyst for ring opening of epoxides with an amine.

scholarly journals Asymmetric ring-opening reaction of meso-epoxides with aromatic amines using homochiral metal–organic frameworks as recyclable heterogeneous catalysts

RSC Advances ◽  
2018 ◽  
Vol 8 (49) ◽  
pp. 28139-28146 ◽  
Author(s):  
Koichi Tanaka ◽  
Maya Kinoshita ◽  
Jun Kayahara ◽  
Yutaro Uebayashi ◽  
Kazusada Nakaji ◽  
...  
Keyword(s):  
Aromatic Amines ◽  
Ring Opening ◽  
Heterogeneous Catalysts ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Amino Alcohols ◽  
Ring Opening Reaction ◽  
Ring Opening Reactions ◽  
Metal Organic ◽  
Asymmetric Ring Opening

Asymmetric ring-opening reactions of meso-epoxides by aromatic amines were achieved by using some chiral metal–organic frameworks. The corresponding β-amino alcohols were obtained with good yields and enantioselectivities (up to 97% ee).

scholarly journals Copolymerization of D,L-lactide and ε-caprolactone using tin(II) octanoate as catalysts: an insight into copolymer microstructure

2020 ◽  
pp. 43-49
Author(s):  
Sergei V. Kostjuk
Keyword(s):  
Ring Opening ◽  
Early Stage ◽  
Random Copolymer ◽  
Transesterification Reaction ◽  
Copolymer Microstructure ◽  
Insight Into

Sn(Oct)2-catalyzed ring-opening copolymerization of D,L-lactide and e-caprolactone in bulk at 130 °C at different D,L-lactide/e-caprolactone has been studied. It was shown that independent on the initial comonomers ratio, the synthesized copolymers are enriched by D,L-lactide at the early stage of reaction indicating the formation of gradient-like copolymer. However, the intensive transesterification reaction both during the polymerization and at the monomer-starved conditions leads to the redistribution of the monomer sequences and formation of the random copolymer. The synthesized copolymers are characterized by high polydispersity (Đ > 2.0), which raises when the reaction mixture was kept under monomer-starved conditions that confirms the occurrence of transesterification. The formation of random copolymer is confirmed by single Tg value, which gradually increased with the increase of the amount of D,L-lactide in the copolymer from –48.6 °C to 33.3 °C for D,L-lactide/e-caprolactone ratio in copolymer of 20:80 and 90:10 mol/mol, respectively.

Lutetium and yttrium complexes supported by an anilido-oxazoline ligand for polymerization of 1,3-conjugated dienes and ε-caprolactone

2020 ◽  
Vol 44 (1) ◽  
pp. 121-128
Author(s):  
Wenqiang Li ◽  
Xinxin Jiang ◽  
Yat-Ming So ◽  
Gaohong He ◽  
Yu Pan
Keyword(s):  
High Activity ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Conjugated Dienes ◽  
Conjugated Diene ◽  
Yttrium Complexes

Lutetium and yttrium complexes supported by an anilido-oxazoline ligand exhibit high cis-1,4 stereoselectivity for 1,3-conjugated diene polymerization and high activity for ring-opening polymerization of ε-caprolactone.

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