observed in situ, which resulted in the formation of CO and dimethylamine. The scope of this new mode of bond activation is extended to the synthesis of urea derivatives from amines using DMF as a carbon monoxide (CO) surrogate. This catalytic protocol allows the synthesis of simple and functionalized urea derivatives with liberation of hydrogen, devoid of any stoichiometric activating reagents, and avoids
Ruthenium-Catalyzed Urea Synthesis Using Methanol as the C1 Source
作者:Seung Hyo Kim、Soon Hyeok Hong
DOI:10.1021/acs.orglett.5b03328
日期:2016.1.15
An unprecedented protocol for urea synthesis directly from methanol and amine was accomplished. The reaction is highly atom-economical, producing hydrogen as the sole byproduct. Commercially available ruthenium pincer complexes were used as catalysts. In addition, no additive, such as a base, oxidant, or hydrogen acceptor, was required. Furthermore, unsymmetrical ureaderivatives were successfully
Equipping metallo-supramolecular macrocycles with functional groups: assemblies of pyridine-substituted urea ligands
作者:Ralf W. Troff、Rainer Hovorka、Torsten Weilandt、Arne Lützen、Mario Cetina、Martin Nieger、Dieter Lentz、Kari Rissanen、Christoph A. Schalley
DOI:10.1039/c2dt30190c
日期:——
A series of di-(m-pyridyl)-urea ligands were prepared and characterized with respect to their conformations by NOESY experiments and crystallography. Methyl substitution in different positions of the pyridine rings provides control over the position of the pyridine N atoms relative to the urea carbonyl group. The ligands were used to self-assemble metallo-supramolecular M2L2 and M3L3 macrocycles which are generated in a finely balanced equilibrium in DMSO and DMF according to DOSY NMR experiments and ESI FTICR mass spectrometry. Again, crystallography was used to characterize the assemblies. Methyl substitution in positions next to the pyridine nitrogen prevents coordination, while the other ligands form small metallo-supramolecular macrocycles. The incorporated urea carbonyl groups provide hydrogen bonding sites which converge towards the center of the assemblies.
我们制备了一系列二(间位吡啶基)脲配体,并通过 NOESY 实验和晶体学研究确定了它们的构象特征。通过在吡啶环的不同位置进行甲基取代,可以控制吡啶 N 原子相对于脲羰基的位置。这些配体被用于自组装金属超分子 M2L2 和 M3L3 大环,根据 DOSY NMR 实验和 ESI FTICR 质谱分析,这些大环是在 DMSO 和 DMF 中精细平衡生成的。同样,晶体学也被用来表征这些组装体。吡啶氮旁边位置的甲基取代阻止了配位,而其他配体则形成了小的金属超分子大环。加入的脲羰基提供了氢键位点,这些氢键位点向组装体的中心汇聚。
PYRIDINIUM COMPOUNDS, A SYNTHESIS METHOD THEREFOR, METAL OR METAL ALLOY PLATING BATHS CONTAINING SAID PYRIDINIUM COMPOUNDS AND A METHOD FOR USE OF SAID METAL OR METAL ALLOY PLATING BATHS
申请人:Atotech Deutschland GmbH
公开号:US20200231565A1
公开(公告)日:2020-07-23
The present invention concerns pyridinium compounds, a synthesis method for their preparation, metal or metal alloy plating baths containing said pyridinium compounds and a method for use of said metal or metal alloy plating baths.
The plating baths are particularly suitable for use in filling of recessed structures in the electronics and semiconductor industry including dual damascene applications.
Self-assembly of the cyclic dimer [Cu(hfac)2(bpmu)]2 (bpmu=N,N′-bis(3-pyridylmethyl)urea; hfac=hexafluoroacetylacetonate ion) using coordination chemistry and predictable OC(N–H)2⋯OC hydrogen bonds
作者:Juan Granifo、María T. Garland、Ricardo Baggio
DOI:10.1016/j.inoche.2005.03.018
日期:2005.6
Abstract A novel binuclear metallacyclic complex, [Cu(hfac)2(bpmu)]2, was isolated by reacting copper(II) hexafluoroacetylacetonate with the bpmu ligand. The crystalstructure reveals the presence of dimetal units with the Cu(II) centers in a six-coordinate environment and bridged by the bpmu spacers. The crystal consists of a racemate with the two copper(II) ions of one dimer molecule carrying either