Flavoproteins have long been recognized as hydrogen and electron carriers between pyridine nucleotides and cytochromes. Cytochrome reductases the oxidation-reduction mechanisms of which have been extensively studied (1) have contained metals, as have other flavin enzymes with cytochrome reductase activity, such as xanthine oxidase (a), liver aldehyde oxidase (3), and Neurospora (4) and Pseudomo...

M. Breza Faculty of Chemical Technology, Slovak Technical University, Radlinskeho 9, 812 37 Bratislava, Slovak Republic Z. Naturforsch. 49c, 571-578 (1994); received April 25, 1994 [(N-salicylidene-D,L-glutamato)(pyridine)]copper(II), Crystal Structure, INDO/2 Charges, Metabolic Reactions of Amino Acids, Vitamin B6 Catalysis, Reaction Mechanism The crystal structure of [(N-salicylidene-D,L-glut...

Flavoproteins have long been recognized as hydrogen and electron carriers between pyridine nucleotides and cytochromes. Cytochrome reductases the oxidation-reduction mechanisms of which have been extensively studied (1) have contained metals, as have other flavin enzymes with cytochrome reductase activity, such as xanthine oxidase (a), liver aldehyde oxidase (3), and Neurospora (4) and Pseudomo...

A novel variant of an iridium-based organometallic catalyst was synthesized and used to enhance the NMR signals of pyridine in a heterogeneous phase by immobilization on polymer microbead solid supports. Upon administration of parahydrogen (pH2) gas to a methanol mixture containing the HET-SABRE catalyst particles and the pyridine, up to fivefold enhancements were observed in the (1)H NMR spect...

Introduction 5-Hydroxymethyl-2-furaldehyde (HMF), as diformylfurane precursor (DFF), is obtained from fructose or glucose dehydration. DFF is a versatile chemical, and there are numerous reports describing various applications as a monomer, as starting materials for the synthesis of pharmaceuticals and antifungal agents [1]. To date, few reports describe the use of air to oxidize (HMF) with het...

Re(CO)5Cl readily reacts with pyridine-derivatized porphyrins to give molecular squares or planar dimers featuring fac-Re(CO)3(Cl) corners. Chelating ligands, in sequential combination with pyridine-derivatized porphyrins, can be used to obtain related cofacial porphyrin assemblies. Films and membranes displaying molecular-scale porosity can be generated from squares by: (1) van der Waals aggre...

Coupling picolinic acid (pyridine-2-carboxylic acid) and pyridine-2,6-dicarboxylic acid with N-alkylanilines affords a range of mono- and bis-amides in good to moderate yields. These amides are of interest for potential applications in catalysis, coordination chemistry and molecular devices. The reaction of picolinic acid with thionyl chloride to generate the acid chloride in situ leads not onl...

A whole-cell based method was developed for the regioselective synthesis of arabinocytosine laurate. Among the seven kinds of bacteria strains tested in the acylation reaction, Pseudomonas fluorescens gave the highest productivity and a higher 5'-regioselectivity than 99%. Compared with pure organic solvents, the use of organic solvent mixtures greatly promoted the yield of the whole-cell catal...

Accurate calculations of adsorption energies of cyclic molecules are of key importance in investigations of, e.g., hydrodesulfurization (HDS) catalysis. The present density functional theory (DFT) study of a set of important reactants, products, and inhibitors in HDS catalysis demonstrates that van der Waals interactions are essential for binding energies on MoS(2) surfaces and that DFT with a ...