Metal ion-induced self-assembly of functionalized 2,6-oligopyridines. 1. Ligand design, synthesis, and characterization
摘要:
Synthetic sequences utilizing alpha-oxoketene dithioacetal and enolate chemistry have been developed for the preparation of new functionalized bipyridines, terpyridines, quaterpyridines, quinquepyridines, sexipyridines, septipyridines, octipyridines, novipyridines, and decipyridines. Obtained in moderate to good yields, these oligopyridines were characterized by analytical and spectral data and, for sexipyridine, by X-ray crystallography.
Synthetic Approaches to Polypyridyl Bridging Ligands with Proximal Multidentate Binding Sites
摘要:
A series of 12 bridging ligands was prepared. These ligands include a central linker appended to two 1,8-naphthyrid-2-yl or two 1,10-phenanthrolin-2-yl units. The linkers include pyridazin-3.6-diyl, 1,8-naphthyrid-2,7-diyl, 2,2'-bipyrid-6,6'-diyl, 1, 10-phenanthrolin-2,9-diyl, 1,2-di(2'-pyrid-6'-yl)ethyne, and 3,6-di(2'-pyrid-6'-yl)pyridazine. The ligands were synthesized from the diacetyl derivative of the central linker by a Friedlander condensation with either 2-aminonicotinaldehyde or 8-amino-7-quinolinecarbaldehyde. The precursor diacetyl derivatives were, in turn, prepared by pathways involving Stille and Sonogashira couplings. Examination of the electronic absorption spectra of the bridging ligands shows the strongest correlation to be between pairs of ligands having the same central linker. Complexation studies will follow.
Manganese-Catalyzed Hydroboration of Terminal Olefins and Metal-Dependent Selectivity in Internal Olefin Isomerization–Hydroboration
作者:Subhash Garhwal、Asja A. Kroeger、Ranjeesh Thenarukandiyil、Natalia Fridman、Amir Karton、Graham de Ruiter
DOI:10.1021/acs.inorgchem.0c03451
日期:2021.1.4
In the past decade, the use of earth-abundant metals in homogeneous catalysis has flourished. In particular, metals such as cobalt and iron have been used extensively in reductive transformations including hydrogenation, hydroboration, and hydrosilylation. Manganese, on the other hand, has been considerably less explored in these reductive transformations. Here, we report a well-defined manganese complex
HETEROCYCLIC COMPOUND, AND ORGANIC LIGHT-EMITTING DEVICE USING SAME
申请人:HEESUNG MATERIAL LTD.
公开号:US20190233398A1
公开(公告)日:2019-08-01
The present application provides a hetero-cyclic compound capable of significantly enhancing lifespan, efficiency, electrochemical stability and thermal stability of an organic light emitting device, and an organic light emitting device containing the hetero-cyclic compound in an organic compound layer.
Solid and solution state flexibility of sterically congested bis(imino)bipyridine complexes of zinc(<scp>ii</scp>) and nickel(<scp>ii</scp>)
作者:Gerry A. Griffith、Mohamed J. Al-Khatib、Kalpana Patel、Kuldip Singh、Gregory A. Solan
DOI:10.1039/b811309b
日期:——
Two new sterically demanding bis(imino)bipyridine ligands, 6,6'-(2,6-i-Pr(2)C(6)H(3))N=R}(2)C(10)H(6)N(2) (R = H (L1), Me (L2)), have been prepared in high yield by the condensation reaction of 2,6-diisopropylaniline with 6,6'-(O=R)(2)C(10)H(6)N(2) (R = H, Me). Palladium(0)-mediated cross coupling of 2-(Bu(3)Sn)-6-C(Me)OCH(2)CH(2)O}C(5)H(3)N with 2-Br-6-C(Me)OCH(2)CH(2)O}C(5)H(3)N, followed by an
Vinylation of Aldehydes Using Mn/Cr Alloy and a N<sub>4</sub>-Ligand/Ni<sup>II</sup>-Catalyst
作者:Wacharee Harnying、Albrecht Berkessel
DOI:10.1002/chem.201500024
日期:2015.4.13
We report an efficient and practical protocol for the Cr/Ni‐catalyzed vinylation of aldehydes, based on the use of Mn/Cralloy (ca. 10 % Cr) and TMSCl. No additional Cr salts need to be added. In the presence of NiCl2 (0.3 mol %) and a bis(ketimino)‐2,2′‐bipyridine as N4‐chelating ligand (1 mol %), the vinylations proceed smoothly at room temperature. The presence of catalytic amounts of MeOH and LiOAc
Triazolopyridines. 18. Nucleophilic substitution reactions on triazolopyridines; a new route to 2,2′-bipyridines
作者:Gurnos Jones、Mark A. Pitman、Edward Lunt、David J. Lythgoe、Belén Abarca、Rafael Ballesteros、Mostafá Elmasnaouy
DOI:10.1016/s0040-4020(97)00491-2
日期:1997.6
The synthesis of some 5-, 6-, and 7-halogenotriazolopyridines is described, and their reactions with nucleophiles. The formation of 7,7′-bitriazolopyridines provides a new synthesis of 2,2′-bipyridines.