Catalytic nucleophilic addition of olefinic CH bond to α,β-unsaturated-γ-lactams
摘要:
A novel catalytic nucleophilic addition of olefins to alpha,beta-unsaturated-gamma-lactams has been developed with a cyclic N-acyliminium ion as a key intermediate. It provides an efficient approach to 5-alkenyl-2-pyrrolidinones from simple and readily available starting materials and the desired products could be obtained in moderate to good yields (23-85%). (C) 2015 Elsevier Ltd. All rights reserved.
Axial Ligand Field in <i>D</i><sub>4<i>d</i></sub> Coordination Symmetry: Magnetic Relaxation of Dy SMMs Perturbed by Counteranions
作者:Jianfeng Wu、Olivier Cador、Xiao-Lei Li、Lang Zhao、Boris Le Guennic、Jinkui Tang
DOI:10.1021/acs.inorgchem.7b01582
日期:2017.9.18
axial ligand field with short Dy–Osali distances and large ∠Osali–Dy–Osali angles, while the quantum tunneling relaxation is probably dictated by the π–π stacking of the Lz ligands, which induces an axial constriction of the coordinating plane. Ab initio calculations substantiate the diversity of the magnetic behaviors in these complexes and highlight the importance of axial ligand field with short Dy–Osali
Solubilized Lanthanide Triflates: Lewis Acid Catalysis by Polyether and Poly(ethylene glycol) Complexes of Ln(OTf)<sub>3</sub>
作者:Helen C. Aspinall、Jennifer L. M. Dwyer、Nicholas Greeves、Edward G. McIver、J. Christopher Woolley
DOI:10.1021/om9709087
日期:1998.4.1
Complexes of lanthanide triflates Ln(OTf)3 with polyether (MeO(CH2CH2O)nMe) and poly(ethylene glycol) (HO(CH2CH2O)nH) ligands (n = 2−4) have been prepared and characterized, and the activity of these complexes as Lewis acid catalysts has been investigated. The complexes [Ln(OTf)3(HO(CH2CH2O)nH)] have been shown to catalyze the allylation of a range of aldehydes with allyltributylstannane, and the complexes
Functionalized Trigonal Lanthanide Complexes: A New Family of 4f Single-Ion Magnets
作者:Christian D. Buch、Steen H. Hansen、Camilla M. Tram、Dmitri Mitcov、Stergios Piligkos
DOI:10.1021/acs.inorgchem.0c02121
日期:2020.11.16
We report the synthesis, characterization, and magnetic properties of eight neutral functionalized trigonal lanthanide coordination complexes LnL with Ln = Gd (1), Tb (2), Dy (3), Ho (4), Er (5), Tm (6), Yb (7), Lu (8). These were prepared through a one-pot synthesis where, first, the ligand H3L was synthesized in situ through a Schiff base reaction of tris(2-aminoethyl)amine with 2,6-diformyl-p-cresol
我们报告的合成,表征和磁性的八个中性功能化的三角镧系配合物LnL与Ln = Gd(1),Tb(2),Dy(3),Ho(4),Er(5),Tm(6),Yb(7),Lu(8)。这些是通过一釜合成,其中,首先,将配位体H制备的3 L的合成在原位通过三(2-氨基乙基)2,6-二diformyl-胺的席夫碱反应p甲酚。加入Ln(OTf)3 · x H 2后O和碱,得到LnL。粉末X射线衍射证实所有络合物都是同构的。LnL含有侧基,非配位羰基官能团,具有反应性,代表直接锚定在适当官能化表面上的点。此外,这些反应性羰基官能团可用于后官能化LnL:例如,使用芳族π系统。我们提出本文的席夫碱缩合7与苄胺,得到9以及表征和磁特性9。我们的研究将LnL确立为用于Ln基单离子磁体表面沉积的真正通用模块。
Near Isotropic <i>D</i><sub>4<i>d</i></sub> Spin Qubits as Nodes of a Gd(III)-Based Metal–Organic Framework
the synthesis and characterization of a gadolinium(III)-based MOF, [Gd(bipyNO)4](TfO)3·xMeOH (bipyNO = bipyridine,N,N′-dioxide; TfO = triflate; and MeOH = methanol) (quMOF-1), which presents a unique coordination geometry that leads to a tiny magnetic anisotropy (in terms of D, an equivalent zero-field splitting would be achieved by D = 0.006 cm–1) even compared with regular Gd(III) complexes. Pulsed