Sugar‐Based Alternating Copolymers via Photoinduced Radical Copolymerization of Levoglucosenone and Vinyl Ethers

A family of 17 sugar-based alternating copolymers was synthesized via photoinduced radical copolymerization of naturally occurring levoglucosenone (LGO) and commercially available vinyl ethers. The r...

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Selective Cascade Metathesis Polymerization of Dicycloalkenes and Their Chemical Recycling

We report a highly selective CMP of dicycloalkenes using G2 catalysts, obtaining well-defined polymer structures with excellent cascade efficiency (>99%) and TON up to 3550. Sulfonamide-linked dicycl...

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2H Quadrupolar Coupling Constant: A Spectroscopic Ruler for Transition Metal–Hydride Bond Distances in Molecular and Surface Sites

Transition metal hydrides (TMHs) find numerous applications across fields from catalysis to H2 storage. Yet, determining the structure of TMHs can remain a challenge, as hydrogen is difficult to detec...

pubs.acs.org

Click To Stack: Shape-Assisted Self-Assembly of Unflattened Macrocycles into Waveguiding Elastic Crystals

Designing molecular crystals for practical applications requires precise control over intermolecular interactions. We report a click-to-stack strategy to enable facile construction and systematic structural modification of tetraarene-fused cyclooctatetraenes. These saddle-shaped molecules self-assemble into one-dimensional columns with exceptional precision, driven solely by weak van der Waals interactions. Single-crystal X-ray crystallographic and computational studies revealed fully eclipsed π–π stacking, reinforced by the shape complementarity of the negatively curved molecular contour. With alkoxy groups tethered, the antiparallel alignment of coaxial cable-like assemblies produces centimeter-long voidless crystals that exhibit remarkable structural durability under mechanical stress. These glow stick-like elastic crystalline rods display optical waveguiding properties, demonstrating the practical utility of highly anisotropic molecular assemblies with structural uniformity and resilience.

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Controlled polymerization of levoglucosenone-derived enynes to give bio-based polymers with tunable degradation rates and high glass transition temperatures

In recent years, pollution from plastic waste has intensified the demand for sustainable polymers. Hence, biomass-derived degradable polymers offer a promising solution. For example, levoglucosenone, ...

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Low-Temperature Direct Arylation Polymerization for the Sustainable Synthesis of a Library of Low-Defect Donor–Acceptor Conjugated Polymers via Pd/Ag Dual-Catalysis

Donor–acceptor alternating conjugated polymers (D–A CPs) are one of the best materials for high-performance organic electronic devices, owing to their low bandgap and high charge carrier mobility. How...

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Degradable Alternating Copolymers from Living Radical Copolymerization of Natural Levoglucosenone and Dienes

Here, we present an efficient synthetic route to biobased alternating copolymers via the living radical copolymerization of naturally occurring levoglucosenone (LGO) and dienes. By employing reversible addition–fragmentation chain transfer (RAFT) polymerization, well-defined LGO-derived copolymers were readily synthesized featuring high degrees of alternation, well-controlled molecular weights, and excellent end-group fidelity. Additionally, the alternating copolymers exhibited thermal and mechanical properties comparable to those of the commodity polystyrene. Furthermore, an on-demand metathesis degradation was identified, highlighting their potential as degradable materials.

pubs.acs.org

Synthesis of Linear and Cyclic Poly(allenamer)s by Powerful Cyclic–Alkyl–Amino–Carbene (CAAC) Ruthenium Catalysts and Facile Post‐modification

We synthesized linear/cyclic poly(allenamer)s (PAs) from cycloallenes by CAAC-Ru catalysts. Mechanism studies suggested CAAC ligands enhanced the stability of propagating Ru vinylidene, producing var...

doi.org

Air and Thermally Stable Cyclic (Alkyl)(amino)carbene Ruthenium Complexes for Efficient Ring Expansion Metathesis Polymerization

Ring expansion metathesis polymerization (REMP) has emerged as a potent strategy for obtaining cyclic polymers over the past two decades. The scope of monomers, however, remains limited due to the poo...

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