作者:Shunxi Dong、Marcus Frings、Duo Zhang、Qianqian Guo、Constantin G. Daniliuc、Hanchao Cheng、Carsten Bolm
DOI:10.1002/chem.201703263
日期:2017.10.9
An N-heterocyclic carbene (NHC)-catalyzed highlydiastereo- and enantioselective formal [3+2] reaction of o-hydroxy aromatic aldimines and cinnamaldehydes leading to enantioenriched trans-γ-lactams was developed. Subsequent transformations allowed modifying the heterocyclic core of the products. An organocatalytic kinetic resolution of chiral lactams was demonstrated in a first proof-of-principle study
Qualitative Analysis of the Stability of the Oxazine Ring of Various Benzoxazine and Pyridooxazine Derivatives with Proton Nuclear Magnetic Resonance Spectroscopy
作者:Gerard P. Moloney、David J. Craik、Magdy N. Iskander
DOI:10.1002/jps.2600810721
日期:1992.7
3-benzoxazine and 3,4-dihydro-1,3-pyridooxazine derivatives was synthesized, and the hydrolysis of the derivatives was studied with proton nuclearmagneticresonancespectroscopy. The oxazine derivatives underwent various degrees of hydrolysis when H2O was added to dimethyl sulfoxide solutions of the compounds. The rates and extents of decomposition of the oxazine ring systems depended on the electronic effects
Chirality and diastereoselection in the μ-oxo diiron complexes L2Fe–O–FeL2 (L = bidentate salicylaldiminato)
作者:Jan M. Becker、James Barker、Guy J. Clarkson、Remy van Gorkum、Gursharon K. Johal、Richard I. Walton、Peter Scott
DOI:10.1039/b905706d
日期:——
synthesised, usually by salt metathesis but on one occasion via the (sal)2Fe complex, and characterised by standard methods. Two molecular structure determinations indicate the expected tetrahedral geometry. Treatment with dry oxygen yielded the Fe(III) complexes [(FeL2)2-μ-O], generally in high yield and in the absence of hydroxylated impurities; one bulky complex L2Fe gave no oxidation product for steric
Effect of substituents on the UV spectra of supermolecular system: Silver nanoparticles with bi-aryl Schiff bases containing hydroxyl
作者:Chao-Tun Cao、Shimao Cheng、Jingyuan Zhang、Chenzhong Cao
DOI:10.1002/poc.3910
日期:2019.3
Effect of substituents on the ultraviolet (UV) spectra of supermolecular system involving silver nanoparticles (AgNPs) and Schiffbases was investigated. AgNPs and 49 samples of model compounds (MC), bi‐aryl Schiffbases containing hydroxyl (XBAY, involving 4‐OHArCHNArY, 2‐OHArCHNArY, XArCHNAr‐4′‐OH, and XArCHNAr‐2′‐OH), were synthesized. The size of AgNPs was characterized by transmission electron
Influence of substituents on the structure of Schiff bases Cu(II) complexes
作者:Yan Xiao、Chenzhong Cao
DOI:10.1016/j.molstruc.2020.127916
日期:2020.6
Abstract The relationship between molecular conformation and substituent effects of salicylaldehyde Schiff-base Cu(II) complexes was explored. For this study, eight samples of the complexes Cu(Sal-X)2 (X = OMe, Me, H, F, Cl, Br, CF3 and CN) were obtained by reaction of Cu(OAc)2 with Schiff base ligands (Sal-X) derived from Salicydaldehyde, and their crystal structures were characterized by the X-ray
摘要 探讨了水杨醛席夫碱Cu(II)配合物的分子构象与取代基效应的关系。在本研究中,通过 Cu(OAc)2 与席夫碱配体的反应获得了 8 个配合物 Cu(Sal-X)2(X = OMe、Me、H、F、Cl、Br、CF3 和 CN)的样品( Sal-X) 衍生自水杨醛,其晶体结构通过 X 射线衍射技术表征。QSPR 方法用于更深入地了解 Cu(Sal-X)2 的几何结构。结果表明,Cu(Sal-X)2的主要几何参数由苯胺环上的取代基决定。即Cu-O-N面与O-CN面之间的二面角τ1随着取代基给电子效应和吸电子效应的增加而增加,而取代基的电子效应对 τ2 有相反的影响,τ2 是苯胺环平面和 C-N-Cu 平面之间的二面角。此外,键长 L Cu - N 随着取代基激发态参数 σ cc ex 的增加而减小,这增强了 C-N 键的能量。