Aluminum Complexes Bearing Bidentate Amido–Phosphine Ligands for Ring-Opening Polymerization of ε-Caprolactone: Steric Effect on Coordination Chemistry and Reactivity
作者:Chuanzhi Wei、Binghao Han、Dejuan Zheng、Quande Zheng、Shaofeng Liu、Zhibo Li
DOI:10.1021/acs.organomet.9b00502
日期:2019.10.14
structures suggested that different substituents on the ligands could lead to unignorable changed coordinationenvironments around the Al center, thus affecting their catalytic properties. In the presence of BnOH, complexes Al1–Al5 efficiently catalyzed the ring-opening polymerization (ROP) of ε-caprolactone (ε-CL) with high conversions in a controlled manner, and high molecular weights (Mn up to 118.6
Bulky arene-bridged bis(amide) and bis(amidinate) complexes of germanium(<scp>ii</scp>) and tin(<scp>ii</scp>)
作者:Palak Garg、Deepak Dange、Cameron Jones
DOI:10.1039/d1dt01642c
日期:——
SnBr2 to yield a series of amidotetrelylenecyclophanes (:E(μ-L1)2E: and :E(μ-L2)2E:, E = Ge or Sn) and bis(halotetrelylene) complexes (:E(X)(μ-L3)(X)E:, E = Ge or Sn, X = Cl or Br; and :Ge(Cl)(μ-L4)(Cl)Ge:). Reduction of :Ge(Cl)(μ-L4)(Cl)Ge: with KC8 afforded the crystallographically characterised bis(amido/amidinatogermylene) compound, :Ge(μ-L4)2Ge:, which is believed to have formed via a disproportionation
几种新的、非常庞大的芳烃桥连双(胺)(即1,3- 和 1,4-N(H)(SiPr i 3 )} 2 (μ-C 6 H 4 )、L 1 H 2和L 2 H 2)和双(脒)前配体(即4,6-[Dip(H)N](DipN)C} 2 (μ-DBF), DBF = dibenzofurandiyl, L 3 H 2 ; 和 1,3-Ar † N(H)C(Bu t )N} 2 (μ-C 6 H 4 ), Ar † = C 6 H 2 C(H)Ph 2} 2 Pr i -2,6,4, L 4 H 2 ) 已开发。所有都可以用 LiBu n双重去质子化。所得的二锂盐与 GeCl 2 ·(二恶烷) 或 SnBr 2反应生成一系列酰胺基三亚甲基环芳烃 (:E(μ-L 1 ) 2 E: 和 :E(μ-L 2 ) 2 E:,E = Ge或 Sn) 和双(卤代三亚甲基)配合物(:E(X)(μ-L 3 )(X)E:,E
Chromium complexes supported by the bidentate PN ligands: synthesis, characterization and application for ethylene polymerization
作者:Quande Zheng、Dejuan Zheng、Binghao Han、Shaofeng Liu、Zhibo Li
DOI:10.1039/c8dt02834f
日期:——
structures. In the presence of an aluminum cocatalyst, complexes Cr1–Cr4 show moderate to high activities toward ethylenepolymerization. The nature of the catalysts and various reaction conditions, such as the nature and the amount of cocatalyst, reaction time and temperature, are investigated in detail. The results show that the title complexes have good thermal stability and the substituents on the
Kinetic stabilisation of a molecular strontium hydride complex using an extremely bulky amidinate ligand
作者:Caspar N. de Bruin-Dickason、Thomas Sutcliffe、Carlos Alvarez Lamsfus、Glen B. Deacon、Laurent Maron、Cameron Jones
DOI:10.1039/c7cc09362d
日期:——
The first dimeric strontium hydride complex (see picture, Dip = 2,6-diisopropylphenyl, Ad = 1-adamantyl), and analogous magnesium hydride systems, have been kinetically stabilised by extremely bulky amidinate ligands, developed for this study.