Well-defined lanthanide polysulfide complexes containing S4(2-) and S5(2-) ligands, the samarium(iii) pentasulfide complex Sm(Tp(iPr2))(κ(1)-3,5-(i)Pr2Hpz)(S5) and the tetrasulfide-bridged binuclear ytterbium(iii) complex (μ-S4)[Yb(Tp(iPr2))(κ(1)-3,5-(i)Pr2Hpz)(κ(2)-3,5-(i)Pr2pz)]2 (Tp(iPr2) = hydro-tris(3,5-diisopropylpyrazolyl)borate), have been synthesized and structurally characterized by s...

In this contribution, we disclose the ability of α,ω-diene comonomers, namely 1,7-octadiene and 1–10-undecadiene, as long-chain branching (LCB)/cross-linking promoters in ethylene polymerization catalyzed by bis(indenyl) bis(cyclopentadienyl) catalyst systems, rac-{EBTHI}ZrCl2 (Zr-1) (nBuCp)2ZrCl2 (Zr-2). Both under homogeneous heterogeneous (slurry) conditions, Zr-1-based systems efficiently p...

Several structural subclasses of ligands bind to the benzodiazepine (BZD) binding site of the GABA(A) receptor. Previous studies from this laboratory have suggested that imidazobenzodiazepines (i-BZDs, e.g., Ro 15-1788) require domains in the BZD binding site for high-affinity binding that are distinct from the requirements of classic BZDs (e.g., flunitrazepam). Here, we used systematic mutagen...

A series of three-coordinate norbornylpalladium amido complexes ligated by bulky N-heterocyclic carbene (NHC) ligands were prepared that undergo reductive eliminations to form the alkyl-nitrogen bond of alkylamine products. The rates of reductive elimination reveal that complexes containing more-electron-donating amido groups react faster than those with less-electron-donating amido groups, and...

Surface ligands play critical roles in determining the surface properties of metal clusters. However, modulating and controlling structure clusters through surface-capping-agent displacement is challenging. Herein, [Ag14(SPh(CF3)2)12(PPh3)4(DMF)4] (Ag14-DMF; DMF=N,N-dimethylformamide), with weakly coordinated DMF on silver sites, was synthesized by a mixed-ligands strategy. Owing to high reacti...

To elucidate the relationship between the substrate size and geometric shape of the catalytic site of Thermus maltogenic amylase, Gly50, Asp109, and Val431, located at the interface of the dimer, were replaced with bulky amino acids. The k(cat)/K(m) value of the mutant for amylose increased significantly, whereas that for amylopectin decreased as compared to that of the wild-type enzyme. Thus, ...

Cyclopentadienyl ligands are ubiquitous in lanthanide chemistry and have been used extensively to stabilize low-valent lanthanide(II) complexes. We now report the reactions of β-diketiminate ytterbium(II) hydride [(BDIDipp)Yb(H)]2 (BDIDipp = HC{C(Me)NDipp}2, Dipp 2,6-iPr2C6H3) with tetramethylcyclopentadiene, pentamethylcyclopentadiene, indene, fluorene; provide ready access heteroleptic η5-C5R...

The syntheses of trineophyl(1a) and tri-(-)-menthylstannyl phenylacetylene (1b) as well as that of (E)-1-trineophylestannyl-2-phenylethene (2) and (E)-1-trineophylstannyl1,2-diphenylethene (3) are described. The hydrostannation of 1a with an excess of trimethyltin hydride led to 1,1,1-tris(trimethyltin)-2-phenylethane (4) and/or 1,1-bis(trimethyltin)2-phenylethene (5) depending on the reaction ...