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New Paradigms for Organic Catalysts: The First Organocatalytic Living Polymerization
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A metal-free approach to the living ring-opening polymerization (ROP) of lactide has been developed using strongly basic amines such as 4-(dimethylamino)pyridine as transesterification catalysts.Abstract:
A metal-free approach to the living ring-opening polymerization (ROP, shown schematically) of lactide has been developed using strongly basic amines such as 4-(dimethylamino)pyridine as transesterification catalysts. These organic catalysts must be used in combination with a nucleophile such as an alcohol, which is the actual initiating species.read more
Citations
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Organocatalysis by N-Heterocyclic Carbenes
TL;DR: The inversion of the classical reactivity (Umpolung) opens up new synthetic pathways in biochemical processes as nucleophilic acylations and in nature, the coenzyme thiamine (vitamin B1), a natural thiazolium salt, utilizes a catalytic variant of this concept in biochemical process as nucleophile acylation.
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Controlled ring-opening polymerization of lactide and glycolide.
TL;DR: This work focuses on the characterization of the phytochemical components of Lactide ROP and their role in the regulation of cell reprograming.
Journal ArticleDOI
Organocatalytic ring-opening polymerization.
Nahrain E. Kamber,and Wonhee Jeong,Robert M. Waymouth,Russell C. Pratt,and Bas G. G. Lohmeijer,James L. Hedrick +5 more
TL;DR: This paper presents the design of highly efficient families of “living” polymerization strategies for the synthesis of block, graft, and star polymers through controlled methods for the controlled synthesis of dendritic macromolecules.
Journal ArticleDOI
N‐Heterocyclic Carbenes as Organocatalysts
TL;DR: This work highlights the ever-increasing number of reactions that can be promoted by N-heterocyclic carbenes and investigates the role of benzoin condensation in these reactions.
Journal ArticleDOI
Organocatalysis: Opportunities and Challenges for Polymer Synthesis
TL;DR: In this article, the ring-opening polymerization of cyclic monomers is used as a representative polymerization process to illustrate some of the features of organic catalysts and initiators and compare them to metal-based approaches.
References
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Journal ArticleDOI
Stereospecific Olefin Polymerization with Chiral Metallocene Catalysts
TL;DR: In contrast to heterogeneous Ziegler-Natta catalysts, homogeneous metallocene-based catalysts as discussed by the authors allow efficient control of regio-and stereoregularities, molecular weights and molecular weight distributions, and comonomer incorporation.
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New Strategies for Organic Catalysis: The First Highly Enantioselective Organocatalytic Diels−Alder Reaction
TL;DR: In this article, the first highly enantioselective organocatalytic Diels-Alder reaction was reported, which is the state-of-the-art for asymmetric catalysts.
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Precise control of polyolefin stereochemistry using single-site metal catalysts.
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4-Dialkylaminopyridines as Highly Active Acylation Catalysts. [New synthetic method (25)]
TL;DR: The synthesis of 4-dialkylaminopyridines can be accomplished in two steps starting from pyridine as discussed by the authors, and these derivatives are approximately 104 times more active when used as acylation catalysts.