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2. Preparation of (Bis)Cationic Nitrogen-Ligated I(III) Reagents: Synthesis of [(pyridine)2IPh](OTf)2 and [(4-CF3-pyridine)2IPh](OTf)2

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3. A Pyridine–Pyridine Cross‐Coupling Reaction via Dearomatized Radical Intermediates

   https://doi.org/10.1002/anie.201906267  

   Koniarczyk, J. Luke ; Greenwood, Jacob W. ; Alegre‐Requena, Juan V. ; Paton, Robert S. ; McNally, Andrew ( September 2019 , Angewandte Chemie International Edition)

   A pyridine–pyridine coupling reaction has been developed between pyridyl phosphonium salts and cyanopyridines using B₂pin₂as an electron‐transfer reagent. Complete regio‐ and cross‐selectivity are observed when forming a range of valuable 2,4′‐bipyridines. Phosphonium salts were found to be the only viable radical precursors in this process, and mechanistic studies indicate that the process does not proceed through a Minisci‐type coupling involving a pyridyl radical. Instead, a radical–radical coupling process between a boryl phosphonium pyridyl radical and a boryl‐stabilized cyanopyridine radical explains the C−C bond‐forming step.

    

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4. Electrophile Recruitment as a Structural Element in Bis-Pyrazolate Pyridine Complex Aggregation: Electrophile Recruitment as a Structural Element in Bis-Pyrazolate Pyridine Complex Aggregation

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   Cook, Brian J. ; Pink, Maren ; Chen, Chun-Hsing ; Caulton, Kenneth G. ( December 2018 , European Journal of Inorganic Chemistry)
5. Correlation between backbone and pyridine dynamics in poly( 2‐vinyl pyridine)/silica polymer nanocomposites

   https://doi.org/10.1002/pol.20200416  

   Bailey, Eric J. ; Tyagi, Madhusudan ; Winey, Karen I. ( September 2020 , Journal of Polymer Science)

   Polymer segmental dynamics in polymer nanocomposites (PNCs) can be significantly perturbed from bulk and underlie macroscopic mechanical and transport properties, but fundamental studies are necessary to build correlations between dynamics and properties. To elucidate a mechanistic description of this perturbation and isolate different molecular motions, we present quasi‐elastic neutron scattering (QENS) measurements on PNCs with attractive interactions comprised of colloidal silica nanoparticles (NPs) uniformly dispersed in poly(2‐vinyl pyridine) (P2VP) with and without backbone deuteration. Measurements of fully‐protonated P2VP probe the dynamics of both the polymer backbone and pyridine pendant group; whereas measurements of backbone‐deuterated P2VP isolate the dynamics of only the pyridine ring. On the small length scales (~1 nm) and fast time scales (~1 ns) captured by QENS, we show that the backbone and pyridine ring dynamics are highly coupled at high temperatures and both are slowed by about 35% relative to neat polymer in 25 vol% PNCs. This observation implies that the backbone and pendant interfacial dynamics are perturbed similarly in PNCs, which further develops our fundamental understanding of microscopic properties in PNCs.

    

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