The synthesis of simple imidazolium-based ligand precursors containing a 1,3-alkylidene-2,4,6-trimethylbenzene spacer was examined and different synthetic protocols were applied depending on the nature of the alkylidene arm. For a methylene arm, simple dications 5a,b.2CI were obtained directly. The higher homologue counterparts were conveniently prepared by general multistep routes following a ...

The synthesis of cyclic carbonates by the cycloaddition reaction CO2 with epoxy compounds is one most promising directions in utilization CO2. present work studies ethylene carbonate oxide carbon dioxide presence zinc-phenolate catalysts formula ZnY (where, Y – methylene-bis, thio-bis and dithio-bis alkyl phenols), ionic liquids RLX R H atom or C1 –C8 groups; L cations [NMP]+, [MIM]+, [Py]+ ami...

The successful topochemical polymerization of bis(selenocyanatomethyl)butadyine 1 is achieved upon association in a : co-crystal with 1,2-bis(2-pyridyl)ethylene (2-bpen) through strong and linear (NC)−Se⋅⋅⋅NPy chalcogen bonding (ChB) interactions, allowing for an appropriate parallel alignment the diacetylene moieties toward solid-state reaction. Co-crystal 1⋅(2-bpen) undergoes heating at 100 °...

Variable temperature spectroscopic, kinetic, and chemical studies were performed on a soluble CrIIICl3(PNP) (PNP = bis(diarylphosphino)alkylamine) ethylene trimerization precatalyst to map out its methylaluminoxane (MAO) activation sequence. These studies indicate that treatment of CrIIICl3(PNP) with MAO leads to first replacement of chlorides with alkyl groups, followed by alkyl abstraction, a...

Contributions of the Medical Corps of the Army to Special Articles: the Public Health Laboratory: COLONEL EDGAR ERSKINE HUME........................... 293 The Effect of Tryptophane D ficiency on Reproduction: DR. ANTHONY A. ALBANESE, ROMAINE Thomas Jefferson, the Scientist: FREDERICK E. MCI. RANDALL and DR. L. EMMETT HOLT, JR. BRoasCHfero,.300tnts:FRDRIEE Influence of Fever upon the Action of ...

The ability of Congo red to form complexes with α-proteins, human growth hormone and human interferon-α2b, was found by absorption difference spectroscopy. A human growth hormone– Congo red complex was isolated by gel-permeation chromatography, and its visible absorption spectrum was registered in comparison to free dye. The ability of Congo red to induce dimerization of human growth hormone wa...

The element and orbital-specific electronic structure of thin films of the organic material N,N'-ethylene-bis(1,1,1-trifluoropentane-2,4-dioneiminato)-copper(II) (designated as Cu-TFAC) has been studied using a combination of synchrotron radiation-excited resonant X-ray emission spectroscopy, X-ray photoelectron spectroscopy, X-ray absorption spectroscopy and density functional theory calculati...

Co-crystallization of 1,8-naphthalenedicarboxylic acid (1,8-nap) with trans-1,2-bis(n-pyridyl)ethylene (n,n'-bpe) (n = 2 or 4) yields a discrete four-component molecular assembly, 2(n,n'-bpe).2(1,8-nap) 1, that is held together by four O-H...N hydrogen bonds where the dicarboxylic acid, serving as a linear template, directs alignment of olefins in the solid state for [2 + 2] photoreaction.

A microporous metal-organic framework, MOF, Cu(FMA)(4,4'-Bpe)0.5 (3a, FMA = fumarate; 4,4'-Bpe = 4,4'-Bpe = trans-bis(4-pyridyl)ethylene) was rationally designed from a primitive cubic net whose pores are tuned by double framework interpenetration. With pore cavities of about 3.6 A, which are interconnected by pore windows of 2.0 x 3.2 A, 3a shows highly selective sorption behaviors of gas mole...

The effect of light and calcium depletion on in vivo protein phosphorylation was tested using dark-grown roots of Merit corn. Light caused rapid and specific promotion of phosphorylation of three polypeptides. Pretreatment of roots with ethylene glycol bis N,N,N',N' tetraacetic acid and A23187 prevented light-induced changes in protein phosphorylation. We postulate that these changes in prot...