Solvent Dependence of the Monomer–Dimer Equilibrium of Ketone‐Substituted Triscatecholate Titanium(IV) Complexes
作者:A. Carel N. Kwamen、Judith Jenniches、Iris M. Oppel、Markus Albrecht
DOI:10.1002/chem.202001053
日期:2020.8.17
Hierarchical helicates based on ketone‐substituted titanium(IV)triscatecholates show different monomer‐dimer behavior depending on different solvents. The dimerization constants of a whole series of differently alkyl‐substituted complexes is analyzed to show that the solvent has a very strong influence on the dimerization. Hereby, effects like solvophobicity/philicity, sterics, electronics of the substituents
Employing Arynes for the Generation of Aryl Anion Equivalents and Subsequent Reaction with Aldehydes
作者:Rahul N. Gaykar、Anup Bhunia、Akkattu T. Biju
DOI:10.1021/acs.joc.8b01549
日期:2018.9.21
a new synthetic strategy is demonstrated, where arynes are converted into aryl anionequivalents by treatment with phosphines and a base. The addition of phosphines to arynes form the phosphonium salts, which in the presence of a carbonate base generates the aryl anionequivalent. Subsequent addition of the aryl anions with aldehydes afforded the secondary alcohols.
Hierarchical Assembly of Helicate-Type Dinuclear Titanium(IV) Complexes
作者:Markus Albrecht、Sebastian Mirtschin、Marita de Groot、Ingo Janser、Jan Runsink、Gerhard Raabe、Michael Kogej、Christoph A. Schalley、Roland Fröhlich
DOI:10.1021/ja052326j
日期:2005.7.1
The ligands 4-7-H(2) were used in coordination studies with titanium(IV) and gallium(III) ions to obtain dimeric complexes Li(4)[(4-7)(6)Ti(2)] and Li(6)[(4/5a)(6)Ga(2)]. The X-ray crystal structures of Li(4)[(4)(6)Ti(2)], Li(4)[(5b)(6)Ti(2)], and Li(4)[(7a)(6)Ti(2)] could be obtained. While these complexes are triply lithium-bridged dimers in the solid state, a monomer/dimer equilibrium is observed
配体 4-7-H(2) 用于与钛 (IV) 和镓 (III) 离子的配位研究,以获得二聚体配合物 Li(4)[(4-7)(6)Ti(2)] 和 Li (6)[(4/5a)(6)Ga(2)]。Li(4)[(4)(6)Ti(2)]、Li(4)[(5b)(6)Ti(2)]和Li(4)[(7a)的X射线晶体结构(6)Ti(2)] 可以得到。虽然这些复合物是固态的三重锂桥二聚体,但通过 NMR 光谱和 ESI FT-ICR MS 观察到溶液中的单体/二聚体平衡。二聚体的稳定性通过单体的高负电荷(Ti(IV) 与 Ga(III))增强,当羰基单元是良好的供体(醛与酮和酯)时,当溶剂不能有效地溶剂化桥接时锂离子(DMSO 与丙酮),以及当空间位阻最小时(甲基与伯和仲碳取代基)。二聚体在热力学上受到焓和熵的青睐。ESI FT-ICR 质谱提供了对单体三儿茶酚酸酯复合物以及单儿茶酚配体在二聚体中交换的机制的
79. Studies in chelation. Part IV. Some properties of 2 : 3-dihydroxyphenyl ketones
作者:Wilson Baker、A. R. Smith
DOI:10.1039/jr9360000346
日期:——
Ito,I. et al., Chemical and pharmaceutical bulletin, 1969, vol. 17, # 7, p. 1524 - 1526