More Like this

1. Principal 2-blocks and Sylow 2-subgroups: PRINCIPAL 2-BLOCKS AND SYLOW 2-SUBGROUPS

   https://doi.org/10.1112/blms.12181  

   Schaeffer Fry, A. A.; Taylor, Jay (August 2018, Bulletin of the London Mathematical Society)
2. Direct Glycosidation of 2-Azido-2-deoxyglycosyl Nitrates: Direct Glycosidation of 2-Azido-2-deoxyglycosyl Nitrates

   https://doi.org/10.1002/ejoc.201900748  

   Singh, Yashapal; Wang, Tinghua; Demchenko, Alexei V. (September 2019, European Journal of Organic Chemistry)
3. Crystal structures of 2-bromo-1,1,1,3,3,3-hexamethyl-2-(trimethylsilyl)trisilane and 2-bromo-1,1,1,3,3,3-hexaisopropyl-2-(triisopropylsilyl)trisilane

   https://doi.org/10.1107/S2056989018009696  

   Gulotty, Eva M.; Staples, Richard J.; Biros, Shannon M.; Gaspar, Peter P.; Rath, Nigam P.; Winchester, William R. (August 2018, Acta Crystallographica Section E Crystallographic Communications)

   The synthesis and crystal structures of two tris(trialkylsilyl)silyl bromide compounds, C 9 H 27 BrSi 4 ( I , HypSiBr) and C 27 H 63 BrSi 4 ( II , TipSiBr), are described. Compound I was prepared in 85% yield by free-radical bromination of 1,1,1,3,3,3-hexamethyl-2-(trimethylsilyl)trisilane using bromobutane and 2,2′-azobis(2-methylpropionitrile) as a radical initiator at 333 K. The molecule possesses threefold rotational symmetry, with the central Si atom and the Br atom being located on the threefold rotation axis. The Si—Br bond distance is 2.2990 (12) Å and the Si—Si bond lengths are 2.3477 (8) Å. The Br—Si—Si bond angles are 104.83 (3)° and the Si—Si—Si bond angles are 113.69 (2)°, reflecting the steric hindrance inherent in the three trimethylsilyl groups attached to the central Si atom. Compound II was prepared in 55% yield by free-radical bromination of 1,1,1,3,3,3-hexaisopropyl-2-(triisopropylsilyl)trisilane using N -bromosuccinimide and 2,2′-azobis(2-methylpropionitrile) as a radical initiator at 353 K. Here the Si—Br bond length is 2.3185 (7) Å and the Si—Si bond lengths range from 2.443 (1) to 2.4628 (9) Å. The Br—Si—Si bond angles range from 98.44 (3) to 103.77 (3)°, indicating steric hindrance between the three triisopropylsilyl groups. 

   more » « less
4. Synthesis of 2-azido-2-deoxy- and 2-acetamido-2-deoxy-D-manno derivatives as versatile building blocks

   https://doi.org/10.1016/j.carres.2019.107900  

   Alex, Catherine; Visansirikul, Satsawat; Zhang, Yongzhen; Yasomanee, Jagodige P.; Codee, Jeroen; Demchenko, Alexei V. (February 2020, Carbohydrate Research)
5. COH, SRT 2 2 , and multiple functionals

   https://doi.org/10.3233/COM-190261  

   Dzhafarov, Damir D.; Patey, Ludovic (April 2021, Computability)

   null (Ed.)

   We prove the following result: there is a family R = ⟨ R 0 , R 1 , … ⟩ of subsets of ω such that for every stable coloring c : [ ω ] 2 → k hyperarithmetical in R and every finite collection of Turing functionals, there is an infinite homogeneous set H for c such that none of the finitely many functionals map R ⊕ H to an infinite cohesive set for R. This provides a partial answer to a question in computable combinatorics, whether COH is omnisciently computably reducible to SRT 2 2 . 

   more » « less