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1. Fun with (4+3)-Cycloadditions

   https://doi.org/10.1055/s-0037-1610327  

   Harmata, Michael (February 2019, Synlett)

   This account describes how I began my adventure in the area of (4+3)-cycloadditions and then focuses on two ongoing projects: a new catalytic asymmetric (4+3)-cycloaddition and what might be described as the ‘rebirth’ of oxidopyridinium ion (4+3)-cycloaddition chemistry. References to other people’s work are made where appropriate. 1 Introduction 2 Asymmetric, Catalytic (4+3)-Cycloadditions 3 Oxidopyridinium Ions and (4+3)-Cycloadditions 4 Conclusions and the Future 

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2. Further Confirmation of the Structure of 3′-(2-Pyridyldithio)-3′-deoxyadenosine and 3′-Thio-3′-deoxyadenosine: Synthetic Convergence with Cordycepin

   https://doi.org/10.1021/acs.joc.5c00954  

   Dover, Taylor L; Robins, Jacob G; Mercado, Brandon Q; Schepartz, Alanna; Miller, Scott J (July 2025, The Journal of Organic Chemistry)
3. Abelian surfaces with fixed 3-torsion

   https://doi.org/10.2140/obs.2020.4.91  

   Calegari, Frank; Chidambaram, Shiva; Roberts, David P. (January 2020, Open Book Series)

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4. Noncollinear polar magnet Fe2(SeO3)3(H2O)3 with inequivalent Fe3+ sites

   https://doi.org/10.1063/5.0241243  

   Oyeka, Ebube_E; Huai, Xudong; Marshall, Madalynn; Winiarski, Michał_J; Błachowski, Artur; Cao, Huibo; Tran, Thao_T (December 2024, APL Materials)

   The emergence of novel magnetic states becomes more likely when the inversion symmetry of the crystal field, relative to the center between two spins, is broken. We propose that placing magnetic spins in inequivalent sites in a polar lattice can promote a realization of nontrivial magnetic states and associated magnetic properties. To test our hypothesis, we study Fe2(SeO3)(H2O)3 as a model system that displays two distinct Fe(1) and Fe(2) magnetic sites in a polar structure (R3c space group). At low fields μ0H≤ 0.06 T, the material undergoes an antiferromagnetic ordering with TN1 = 77 K and a second transition at TN2≈ 4 K. At μ0H≥ 0.06 T and 74 K ≤T≤ 76 K, a positive entropy change of ∼0.12 mJ mol−1 K−1 can be associated with a metamagnetic transition to possibly nontrivial spin states. At zero field, Fe(1) is nearly fully ordered at T≈ 25 K, while Fe(2) features magnetic frustration down to T = 4 K. The magnetic ground state, a result corroborated by single-crystal neutron diffraction and 57Fe Mössbauer spectroscopy, is a noncollinear antiparallel arrangement of ferrimagnetic Fe(1)–Fe(2) dimers along the c-axis. The results demonstrate that placing distinct magnetic sites in a polar crystal lattice can enable a new pathway to modifying spin, orbital, and lattice degrees of freedom for unconventional magnetism. 

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5. A Dual-Band 3 × 3 Nolen Matrix Network with Distinct Progressive Phase Difference

   https://doi.org/10.1109/RWS62086.2025.10904829  

   Zhang, Hanxiang; Yan, Hao; Liu, Powei; Pour, Saeed Zolfagahary; Casamayor, Jonathan; Arigong, Bayaner (January 2025, IEEE)