Results 131 to 140 of about 66,029 (249)

NMR‐Based Structural Analysis of Highly Substituted Pyridines From Kondrat'eva Aza‐Diels–Alder Cycloadditions

open access: yesMagnetic Resonance in Chemistry, EarlyView.
We report the results from a kinetic and mechanistic investigation of an inverse‐electron‐demand Diels–Alder (IEDDA) cycloaddition involving an oxazole‐type diene synthesized via an Ugi–Zhu multicomponent reaction (UZ‐3CR). ABSTRACT Pyridines are a crucial class of heterocycles with widespread applications in natural products, pharmaceuticals, and ...
Galdina V. Suárez‐Moreno   +6 more
wiley   +1 more source

Formal Aza‐Diels−Alder Reactions of Spiroindolenines with Electronrich Dienes [PDF]

open access: bronze, 2021
Elisa Brambilla   +4 more
openalex   +1 more source

Charge-Transfer Forces in the Self-Assembly of Heteromolecular Reactive Solids:  Successful Design of Unique (Single-Crystal-to-Single-Crystal) Diels−Alder Cycloadditions [PDF]

open access: yes, 2001
Electron donor/acceptor (EDA) interactions are found to be a versatile methodology for the engineering of reactive heteromolecular crystals. In this way, a series of the charge-transfer π-complexes between bis(alkylimino)-1,4-dithiin acceptors and ...
Kim, J. H.   +2 more
core   +1 more source

A Self‐Healing Conductive PVP/SUM Hydrogel for Real‐Time Human Motion Detection

open access: yesNano Select, EarlyView.
The PVP/SUM hydrogel exhibits self‐healing, conductivity, and strong mechanical performance due to H‐bonds and dipole–dipole interactions. It elongates up to 330% and shows fracture strength between 0.9 and 1.5 MPa under varying strain rates. With a conductivity of 3.28 × 10−5 S/cm, it responds rapidly to human motion, enabling real‐time monitoring for
Vinnakoti Meghana, Illa Ramakanth
wiley   +1 more source

Exploration of the Phytochemical and Antidiabetic Properties of Teucrium polium: A Natural Asset for Type 2 Diabetes Management

open access: yesChemistryOpen, EarlyView.
Teucrium polium shows antidiabetic activity with its phytochemical composition and biological activities. The essential oil is rich in carvacrol, thymol, γ‐terpinene, and o‐cymene, while the aqueous and hydroethanolic extracts are characterized by poliumoside, verbascoside, isorhamnetin‐3‐O‐rutinoside, and apigenin‐7‐rutinoside. Antioxidant activity is
Hajar El Ouadni   +10 more
wiley   +1 more source

2,3‐Dichloro‐5,6‐Dicyano‐1,4‐Benzoquinone (DDQ)‐Mediated CC Bond Formation: Redox Strategies from Stoichiometric to Catalytic Systems

open access: yesChemistryOpen, EarlyView.
2,3‐Dichloro‐5,6‐dicyano‐1,4‐benzoquinone serves as a versatile oxidant and redox catalyst for CC bond formation through hydride abstraction or single‐electron transfer. Stoichiometric and catalytic systems enable benzylic, allylic, and aromatic CH activation under mild, metal‐free conditions, providing sustainable routes to complex and bioactive ...
Dohoon Cha, Sun‐Joon Min
wiley   +1 more source

Reversible Nanocomposites With Carbon Nanotubes as the Diene in the Diels–Alder Reaction

open access: yesPolymer Composites, EarlyView.
Scheme of the reversible nanocomposites through DA and rDA reactions with participation of carbon nanotubes. ABSTRACT Carbon nanotubes (CNTs) often require surface functionalization to facilitate uniform distribution and address issues related to aggregation. Due to the sp2 hybridized carbon atoms on their surface, CNTs readily participate in the Diels–
Jie Guo   +3 more
wiley   +1 more source

Chemical approach for controlling nadimide cure temperature and rate [PDF]

open access: yes, 1984
Polyimide resins suitable for use as composite matrix materials are formed by copolymerization of maleic and norbornenyl endcapped monomers and oligomers.
Lauver, R. W.
core   +2 more sources

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