膦大环的合成是一个相对欠发达的领域,没有标准的合成路线出现。因此,研究了四齿膦大环的两种通用合成途径。两种途径都使用Cu(I)离子作为模板离子,因为与其他金属(例如Pd(II)和Pt(II))不同,可以从大环络合物中除去Cu(I)离子而不会降解大环配体。第一途径涉及使用1,3-二溴丙烷或1,4-二溴丁烷将键合到Cu(I)的两个二齿仲膦偶联。使用此途径,四齿膦大环与–(CH 2)3 OCH 3一起合成结合到P原子上的Ph基团。研究了含有–(CH 2)3 OCH 3基团的大环膦的潜在水溶性,但实验表明这些膦不是水溶性的。第二种合成途径涉及与Cu(I)配位的开链,混合的叔-叔,四齿膦的烷基化。形成大环配体Cu(I通过与KCN水溶液反应除去模板,得到游离的大环膦。已证明该路线可用于制备大环膦配体1,5,9,13-四苯基-1,5,9,13-四磷杂环庚烷。在脱金属之后,该大环配体与Fe(II)和Co(II)配位以形成相应的大环膦配合物。
Influence of Phosphoramidites in Copper-Catalyzed Conjugate Borylation Reaction
摘要:
Copper(I) has become the preferred metal to catalyze the beta-boration of alpha,beta-unsaturated carbonyl compounds, and now we demonstrate that easily accessible monodentate chiral ligands, such as phosphoramidites and phosphites, can be convenient alternative ligands to induce asymmetry in the enantioselective version of this reaction, particularly in the beta-boration of alpha,beta-unsaturated imines.
Binuclear Copper Complexes and Their Catalytic Evaluation
作者:Raj K. Das、Mithun Sarkar、S. M. Wahidur Rahaman、Henri Doucet、Jitendra K. Bera
DOI:10.1002/ejic.201101283
日期:2012.4
dichloromethane. The two copper atoms in complex 1 are bridged by two L 1 ligands in a trans disposition; the naphthyridine nitrogen atoms bridge two copper centers and the carbonyl oxygen atoms occupy sites trans to the Cu···Cu vector. The metal···metal distance is 2.4594(6) A. In contrast, in complex 2, each of the two L 2 ligands bind to the two copper atoms through one naphthyridine nitrogen, a deprotonated amide
A stable well-defined copper hydride cluster consolidated with hemilabile phosphines
作者:Shang-Fu Yuan、Heng-Wang Luyang、Zhen Lei、Xian-Kai Wan、Jiao-Jiao Li、Quan-Ming Wang
DOI:10.1039/d1cc01161h
日期:——
Copperhydrides are very useful in hydrogenation reactions. We report a stable Stryker-type copperhydride reagent protected by hemilabile phosphines: [Cu8H6(dppy)6](OTf)2 (Cu8-H, dppy = diphenylphosphino-2-pyridine). The metal core of this cluster has a bicapped octahedral configuration, and the copper-bound hydrides each triply bridges over a triangular face of the octahedron. This cluster is attractive
氢化铜在氢化反应中非常有用。我们报道了一种受半不稳定膦保护的稳定的Stryker型氢化铜试剂:[Cu 8 H 6(dppy)6 ](OTf)2(Cu 8 -H,dppy =二苯基膦基-2-吡啶)。该团簇的金属芯具有双峰八面体构型,并且与铜结合的氢化物每个都在八面体的三角形面上三重桥连。该簇由于其制备简便且在环境条件下具有出色的稳定性而具有吸引力。在化学计量和催化反应中可比的活性和选择性使Cu 8 -H成为Stryker试剂的有前途的替代品。
Bidentate guanidine ligands with ethylene spacer in copper-dioxygen chemistry: Structural characterization of bis(μ-hydroxo) dicopper complexes
coordination of the copper(II) ion. The bis(μ-hydroxo) dicoppercomplex 1 exhibits a Cu···Cu distance of 2.860(1) A, which is one of the smallest observed for hydroxo-bridged copper compounds so far. The influence of the anion on the structure of the bis(μ-hydroxo) dicopper(II) unit is analyzed for the reported complexes and a literature overview with emphasis on the structural characteristics of the
Five new CuI /[Au(CN)2 ]- -based coordinationpolymer materials-Cu(py)2 [Au(CN)2 ] (1), Cu(PPh3 )(MeCN)[Au(CN)2 ]⋅MeCN (2 a), Cu(PPh3 )(MeCN)[Au(CN)2 ] (2 b), Cu3 (THT)4 [Au(CN)2 ]3 (3 a) and Cu(THT)[Au(CN)2 ] (3 b)-were prepared and characterized in terms of their structural and photoluminescence properties, and thermal stability (py=pyridine, THT=tetrahydrothiophene). While 1 and 2 a/2 b adopted