70917-02-1Relevant articles and documents
Influence of the Base on Pd@MIL-101-NH2(Cr) as Catalyst for the Suzuki-Miyaura Cross-Coupling Reaction
Carson, Fabian,Pascanu, Vlad,Bermejog?mez, Antonio,Zhang, Yi,Platero-Prats, Ana E.,Zou, Xiaodong,Martín-Matute, Belén
, p. 10896 - 10902 (2015)
The chemical stability of metal-organic frameworks (MOFs) is a major factor preventing their use in industrial processes. Herein, it is shown that judicious choice of the base for the Suzuki-Miyaura cross-coupling reaction can avoid decomposition of the MOF catalyst Pd@MIL-101-NH2(Cr). Four bases were compared for the reaction: K2CO3, KF, Cs2CO3 and CsF. The carbonates were the most active and achieved excellent yields in shorter reaction times than the fluorides. However, powder XRD and N2 sorption measurements showed that the MOF catalyst was degraded when carbonates were used but remained crystalline and porous with the fluorides. XANES measurements revealed that the trimeric chromium cluster of Pd@MIL-101-NH2(Cr) is still present in the degraded MOF. In addition, the different countercations of the base significantly affected the catalytic activity of the material. TEM revealed that after several catalytic runs many of the Pd nanoparticles (NPs) had migrated to the external surface of the MOF particles and formed larger aggregates. The Pd NPs were larger after catalysis with caesium bases compared to potassium bases.
Tetrabiphenylporphyrin-based receptors for protein surfaces show sub-nanomolar affinity and enhance unfolding
Aya, Toshihiro,Hamilton, Andrew D.
, p. 2651 - 2654 (2003)
A family of tetrabiphenylporphyrin-based receptors has been synthesized. Receptor 7 showed sub-nanomolar affinity (Kd=0.67 nM) in binding to the surface of cytochrome c. In addition, a stoichiometric amount of the receptor 7 caused a lowering in the Tm of cytochrome c from 85 to 35°C.
Preparation of Polyfunctional Organozinc Halides by an InX3- and LiCl-Catalyzed Zinc Insertion to Aryl and Heteroaryl Iodides and Bromides
Benischke, Andreas D.,Le Corre, Grégoire,Knochel, Paul
supporting information, p. 778 - 782 (2017/02/05)
A catalytic system consisting of InCl3(3 mol %) and LiCl (30 mol %) allows a convenient preparation of polyfunctional arylzinc halides via the insertion of zinc powder to various aryl iodides in THF at 50 °C in up to 95 % yield. The use of a THF/DMPU (1:1) mixture shortens the reaction rates and allows the preparation of keto-substituted arylzinc reagents. In the presence of In(acac)3(3 mol %) and LiCl (150 mol %), the zinc insertion to various aryl and heteroaryl bromides proceeds smoothly (50 °C, 2–18 h). Alkyl bromides are also converted to the corresponding zinc reagents in the presence of In(acac)3(10 mol %) and LiCl (150 mol %) in 70–80 % yield.
Iron-catalyzed oxidative biaryl cross-couplings via mixed diaryl titanates: Significant influence of the order of combining aryl Grignard reagents with titanate
Liu, Kun Ming,Wei, Juan,Duan, Xin Fang
supporting information, p. 4656 - 4658 (2015/05/27)
The mixed diaryl titanates were used for the first time to modify the reactivity of two aryl Grignard reagents. Two titanate intermediates, Ar[Ar′Ti(OR)3]MgX and Ar′[ArTi(OR)3]MgX, formed via alternating the sequence of combining Grignard reagents with ClTi(OR)3 showed a significant reactivity difference. Taking advantage of such different reactivity, two highly structurally similar aryl groups could be facilely assembled through iron-catalyzed oxidative cross-couplings using oxygen as the oxidant. This journal is
