4-Vinyl-, 6-vinyl-, and 4'-vinyl-2,2':6',2"-terpyridinyl ligands: their synthesis and the electrochemistry of their transition-metal coordination complexes
作者:Kevin T. Potts、Douglas A. Usifer、Ana Guadalupe、Hector D. Abruna
DOI:10.1021/ja00247a021
日期:1987.6
followed by generation of the methyl anion with lithium tetramethylpiperidide, reaction of the anion with chloromethyl methyl ether, and introduction of the vinyl group by treatment of the ether with potassium tert-butoxide/THF. Analogous reactions led to the 4-vinyl- and 6-vinyl isomers by using the appropriate methyl-substituted 2-acetylpyridine except that in these instances desulfurization of the 4'-methylthio
Tetrasubstituted furans were efficiently synthesized from Fe(OAc)2-catalyzed C–H/C–H cross-dehydrogenative-coupling (CDC) reactions of activated carbonyl methylenes with S,S-functionalized internal olefins, that is, α-oxo ketene dithioacetals and analogues, under oxidative conditions. β-Ketoesters, 1,3-dicarbonyls, β-keto nitrile, and amide derivatives were used as the coupling partners. The resultant
Enantioselective Excited-State Photoreactions Controlled by a Chiral Hydrogen-Bonding Iridium Sensitizer
作者:Kazimer L. Skubi、Jesse B. Kidd、Hoimin Jung、Ilia A. Guzei、Mu-Hyun Baik、Tehshik P. Yoon
DOI:10.1021/jacs.7b10586
日期:2017.11.29
transition-metal photosensitizer leads to efficient Dexter energy transfer and effective stereoinduction. The relative insensitivity of these organometallic chromophores toward ligand modification enables the optimization of this catalyst structure for high enantiomeric excess at catalyst loadings as much as 100-fold lower than the optimal conditions reported for analogous chiral organic photosensitizers.
Steric Control of Directional Isomerism in Dicopper(I) Helicates of Asymmetrically Substituted 2,2‘:6‘,2‘‘:2‘‘,6‘‘‘-Quaterpyridine Derivatives
作者:E. C. Constable、F. Heirtzler、M. Neuburger、M. Zehnder
DOI:10.1021/ja9623626
日期:1997.6.1
Derivatives of 2,2':6',2'':2'',6'''-quaterpyridine have been prepared which are asymmetrically substituted with alkyl groups in the 4- or 6-position and with various substituents in the 4 '-position. These ligands form dicopper- (I) double helicates which have been investigated by 1 H and 13 C NMR spectroscopic techniques. The formation of helical isomers is shown to depend on the intramolecular interactions
已经制备了 2,2':6',2'':2'',6'''-四联吡啶的衍生物,它们在 4-或 6-位被烷基不对称取代,在 4' 被各种取代基不对称取代-位置。这些配体形成二铜-(I)双螺旋体,已通过 1 H 和 13 C NMR 光谱技术对其进行了研究。显示螺旋异构体的形成取决于双螺旋的组成螺旋体之间的分子内相互作用;4'-甲基取代基与配对螺旋体的 4-取代基发生空间相互作用,导致选择性适中,尽管庞大的 4-取代基会降低选择性。在不存在 4'-取代基的情况下,较小的间距允许组分螺旋体的类似 4-取代基之间的空间相互作用。在每种情况下,
New Approaches to the Synthesis of 2,2′: 6′,2″-Terpyridine and Some of Its Derivatives
作者:V. V. Zamalyutin、V. A. Bezdenezhnykh、A. I. Nichugovskiy、V. R. Flid
DOI:10.1134/s1070428018030089
日期:2018.3
A new two-step procedure has been developed for the synthesis of 2,2′: 6′,2″-terpyridine and 4′-methylsulfanyl-2,2′: 6′,2″-terpyridine in more than 70% yield on the basis of Potts’ condensation. Efficient methods have been proposed for purification of all condensation products.