Preparation of Stereoregular Isotactic Poly(mandelic acid) through Organocatalytic Ring-Opening Polymerization of a CyclicO-Carboxyanhydride
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چکیده
منابع مشابه
Stereoregular Isotactic Poly(mandelic acid) via Organocatalytic Ring-Opening Polymerization of a Cyclic O-carboxyanhydride**
Poly(mandelic acid), PMA, is an aryl analogue of poly(lactic acid), PLA, and a biodegradable analogue of polystyrene. Preparation of stereoregular PMA is reported for the first time in this work using a pyridine-mandelic acid adduct (Py·MA) as an organocatalyst for the ring-opening polymerisation (ROP) of the cyclic O-carboxyanhydride, manOCA. Polymers with narrow polydispersity index and excel...
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Modern synthetic methods have revolutionized polymer chemistry through the development of new and powerful strategies for the controlled synthesis of complex polymer architectures.1-5 Many of these developments were spawned by new classes of transition metal catalysts for the synthesis of new polyolefin microstructures,5 the design of highly efficient families of “living” polymerization strateg...
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Well-defined molecular brushes bearing polypeptides as side chains were prepared by a "grafting through" synthetic strategy with two-dimensional control over the brush molecular architectures. By integrating N-carboxyanhydride ring-opening polymerizations (NCA ROPs) and ring-opening metathesis polymerizations (ROMPs), desirable segment lengths of polypeptide side chains and polynorbornene brush...
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For the first time, the controlled ring-opening polymerization (ROP) of ε-thionocaprolactone (tnCL) is conducted. The organocatalytic ROP of tnCL occurs without carbonyl scrambling, leading to homopoly(ε-thionocaprolactone) (PtnCL). The ROP by base catalysts alone is proposed to proceed via a nucleophilic mechanism, while the addition of an H-bond donating thiourea (TU) is shown to provide exce...
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Thiourea (TU)/amine base cocatalysts are commonly employed for well-controlled, highly active "living" organocatalytic ring-opening polymerizations (ROPs) of cyclic esters and carbonates. In this work, several of the most active cocatalyst pairs are shown by 1H NMR binding studies to be highly associated in solution, dominating all other known noncovalent catalyst/reagent interactions during RO...
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ژورنال
عنوان ژورنال: Angewandte Chemie International Edition
سال: 2014
ISSN: 1433-7851
DOI: 10.1002/anie.201407525