- High-Spin Cobalt(II) Complex with Record-Breaking Anisotropy of the Magnetic Susceptibility According to Paramagnetic NMR Spectroscopy Data
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Abstract: The tetrahedral cobalt(II) complex [CoL2](HNEt3)2 (I), where L is 1,2-bis(methanesulfonamido)benzene, exhibiting the properties of a single-molecule magnet is synthesized and characterized. The electronic structu
- Pankratova, Ya. A.,Nelyubina, Yu. V.,Novikov,Pavlov
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- A Versatile Synthesis of Vinyl-Substituted Heterocycles via Regio- And Enantioselective Pd-Catalyzed Tandem Allylic Substitution
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We herein report a versatile, regio- and enantioselective palladium-catalyzed tandem allylic substitution powered by a chiral bisphosphorus ligand WingPhos with the palladium loading as low as 0.1 mol %, forming a series of chiral vinyl-substituted heterocycles, including tetrahydroquinoxalines, piperazines, dihydro-2H-benzo[b][1,4]-oxazines, and morpholines, in exellent ee's and yields. The protocol features readily available starting materials, mild reaction conditions, and a broad substrate scope. Mechanistic investigation supports a tandem allylic substitution process.
- Qian, Chao,Tang, Wenjun,Tang, Wenjun
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supporting information
p. 4483 - 4488
(2020/06/05)
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- Pd(II)-Catalyzed Aerobic Intermolecular 1,2-Diamination of Conjugated Dienes: A Regio- and Chemoselective [4 + 2] Annulation for the Synthesis of Tetrahydroquinoxalines
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A Pd(II)-catalyzed aerobic intermolecular 1,2-diamination of conjugated dienes was developed for the regio- and chemoselective preparation of a variety of functionalized tetrahydroquinoxalines, using simple sulfonyl protected o-phenylendiamines as a nitrogen source. This methodology provides a direct and efficient synthesis of tetrahydroquinoxalines. O2 was used as the stoichiometric oxidant, and reaction conditions were applied to a series of o-phenylendiamines and conjugated dienes. 35 examples are described, and good yields and selectivities are obtained for the majority of the products.
- Wu, Zhengxing,Wen, Ke,Zhang, Jingang,Zhang, Wanbin
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supporting information
p. 2813 - 2816
(2017/06/07)
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- Synthesis of spirocyclic aminosilanes with electron withdrawing substituents at nitrogen
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The first synthesis of spirocyclic tetrasulfonamidosilanes is described. According to the X-Ray structure analysis of the most stable tetratosylamidosilane obtained the Silicon is bonded to four Nitrogen atoms in a spirocycle and surrounded by four Oxygen
- Wollenweber, Markus,Keese, Reinhart,Stoeckli-Evans, Helen
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p. 145 - 148
(2007/10/03)
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