Studies on the Catalytic Promiscuity of Limonene Epoxide Hydrolases in the Non‐hydrolytic Ring Opening of 1,2‐Epoxides
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DOI: 10.1002/cbic.201900694
Abstract: The non‐hydrolytic ring opening of 1,2‐epoxides in the presence of limonene epoxide hydrolases (LEHs) and different nucleophiles has been investigated. Lyophilized, wild‐type LEHs were tested in selected water‐saturated organic solvents in the presence of cyclohexene… read more here.
Keywords: opening epoxides; ring opening; hydrolytic ring; non hydrolytic ... See more keywords
Ring‐Opening Copolymerization of Styrene Oxide and Cyclic Anhydrides by using Highly Effective Zinc Amido–Oxazolinate Catalysts
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DOI: 10.1002/cctc.201601679
Abstract: Polyesters have been widely applied owing to their biodegradability and biocompatibility. Recently, catalytic ring‐opening copolymerization of cyclic anhydrides and epoxides has emerged as an effective approach for the synthesis of polyesters. Herein, we report a… read more here.
Keywords: ring opening; cyclic anhydrides; styrene oxide; opening copolymerization ... See more keywords
Enzymatic Ring‐Opening Polymerization of Lactones: Traditional Approaches and Alternative Strategies
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DOI: 10.1002/cctc.201900976
Abstract: Biodegradable polymers such as polylactides and other polylactones and their synthesis gain progressively importance. Enzymatic ring‐opening polymerization (eROP) is the next step sustainable synthesis of polyesters, also suitable for biomedical applications due to high selectivity… read more here.
Keywords: ring opening; opening polymerization; polymerization lactones; lactones traditional ... See more keywords
Highly Active N,O Zinc Guanidine Catalysts for the Ring-Opening Polymerization of Lactide.
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DOI: 10.1002/cssc.201701237
Abstract: New zinc guanidine complexes with N,O donor functionalities were prepared, characterized by X-Ray crystallography, and examined for their catalytic activity in the solvent-free ring-opening polymerization (ROP) of technical-grade rac-lactide at 150 °C. All complexes showed a… read more here.
Keywords: zinc guanidine; ring opening; polymerization; opening polymerization ... See more keywords
Regioselective Ring Opening of Glycidol to Monoalkyl Glyceryl Ethers Promoted by an [OSSO]-FeIII Triflate Complex.
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DOI: 10.1002/cssc.201901329
Abstract: A new Fe(III)-triflate complex, bearing a bis-thioether-di-phenolate [OSSO]-type ligand, is reported to promote the ring-opening of glycidol with alcohols under mild reaction conditions (0.05 mol% of catalyst and 80 °C). The reaction proceeds with high… read more here.
Keywords: ring opening; glyceryl ethers; opening glycidol; triflate complex ... See more keywords
Sustainable polythioesters via thio(no)lactones: monomer synthesis, ring-opening polymerization, end-of-life considerations and industrial perspectives.
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DOI: 10.1002/cssc.202202276
Abstract: As the environmental effects of plastics are of ever greater concern, the industry is driven towards more sustainable polymers. Besides sustainability, our fast-developing society imposes the need for highly versatile materials. While aliphatic polyesters (PEs)… read more here.
Keywords: end life; opening polymerization; thio lactones; thio ... See more keywords
Model Studies for the Preparation of Oxepanes and Fused Compounds by Tandem [4+3] Cycloaddition/Ring‐Opening Metathesis/Cross Metathesis
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DOI: 10.1002/ejoc.201700994
Abstract: Functionalised medium-sized ether rings were prepared in an efficient manner by [4+3] cycloaddition followed by ring-opening metathesis. This procedure provided medium-sized rings, which were shown to be useful for the assembly of fused bicyclic structures… read more here.
Keywords: ring opening; cycloaddition; chemistry; opening metathesis ... See more keywords
The mechanism of ring‐opening polymerization of L‐lactide by ICl3 catalysts: Halogen bond catalysis or participating in reactions?
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Computational Chemistry"
DOI: 10.1002/jcc.26059
Abstract: The mechanism of ring‐opening polymerization of L‐lactide by iodine trichloride (ICl3) catalyst has been explored by using density functional theory (DFT) calculations and three catalytic pathways were proposed. The first and second pathways belong to… read more here.
Keywords: ring opening; opening polymerization; polymerization lactide; icl3 catalysts ... See more keywords
Investigation of Tacticity and Living Characteristics of Photoredox-Mediated Metal-Free Ring-Opening Metathesis Polymerization.
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DOI: 10.1002/marc.201600766
Abstract: This study investigated the microstructures of polymers produced via photoredox-mediated metal-free ring-opening metathesis polymerization. Polynorbornene, poly(exo-dihydrodicyclopentadiene), and poly(endo-dicyclopentadiene) were found to have cis olefin contents of 23%, 24%, and 28%, respectively. Additionally, the cis/trans ratio… read more here.
Keywords: free ring; ring opening; polymerization; mediated metal ... See more keywords
Strontium Isopropoxide: A Highly Active Catalyst for the Ring-Opening Polymerization of Lactide and Various Lactones.
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DOI: 10.1002/marc.201900306
Abstract: Commercially available strontium isopropoxide represents a suitable catalyst/initiator for the ring-opening polymerization (ROP) of lactide (LA), ε-caprolactone, δ-valerolactone, δ-caprolactone, and δ-decalactone. Well-defined polyesters are accessible via the solution polymerization of lactide in toluene with a… read more here.
Keywords: ring opening; polymerization; opening polymerization; strontium isopropoxide ... See more keywords
Organocatalytic Synthesis of Alkyne-Functional Aliphatic Polycarbonates via Ring-Opening Polymerization of an Eight-Membered-N-Cyclic Carbonate.
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DOI: 10.1002/marc.202000378
Abstract: The synthesis of well-defined propargyl-functional aliphatic polycarbonates is achieved via the organocatalytic ring-opening polymerization of prop-2-yn-1-yl 2-oxo-1,3,6-dioxazocane-6-carboxylate (P-8NC) using a wide variety of commercially available or readily made, shelf-stable organocatalysts. The resulting homopolymers show low… read more here.
Keywords: aliphatic polycarbonates; ring opening; opening polymerization; functional aliphatic ... See more keywords