Chiral hexamine macrocycle derived from trans-1,2-diaminocyclohexane (DACH) in a complex with diethylzinc efficiently catalyzes the asymmetric hydrosilylation of N-phosphorylated aryl-alkyl or aryl-aryl ketimines in protic media with enantiomeric excess of the product approaching 100%. The cyclic structure of the trianglamine ligand increases the enantioselectivity and/or the yield of the react...

The heme aa3 type cytochrome oxidase from Paracoccus denitrificans incorporated into vesicles with phospholipid reacts during turnover much as the oxidase from mitochondria does. The spectrophotometric changes observed at various wavelengths are closely similar, and the rate is about one-half of that for beef heart oxidase under the same conditions. The rate of appearance of oxidized cytochrome...

The easy leaching of boron from wood preservation formulations has limited the use of this highly active fungicide. The recently discovered adduct with flavonoids allows boron to be retained for longer periods of time within wood and consequently to extend its life. Two different leaching treatments were compared, and the fungal and termite decay were examined. The biological tests showed extre...

The binding of alkalis and calcium to silicate hydrate (C-S-H) can be measured by cation exchange using cobalt hexamine solution with adapted pH. effective capacity (CEC) decreased at higher Ca/Si in C-S-H. A maximum chargeexch/Si 0.08–0.10 was = 0.8 decreasing 0.01–0.02 1.6. At high Ca/Si, only a minor fraction Ca present exchangeable sites, while most the Ca2+ interlayer or surface specifical...

An effective corrosion inhibitor for steel is Hexamine (HMTA). There have been few studies on its corrosion-inhibiting characteristics, particularly in NaCl solution. The electrochemical characteristics of HMTA performance 3.5 wt% solution were examined during this study. Additionally, the properties film surface was investigated. When tested solution, results revealed that a very efficient mil...

This paper describes a indirect complexometric method for the determination of mercury in the presence of co-ions, based on the selective masking ability of potassium iodide. To the mixture of mercury (II) and other metal ion solution, EDTA solution was added in excess of the metal ions present. The pH of the solution was adjusted to 5.0-6.0 using solid hexamine (10 ± 2 g) and surplus EDTA was ...

A recently developed ab initio van der Waals density functional (vdWDF) [1] includes long-range dispersion forces at an electronic level. It promises to extend large-scale electronic structure calculations to the realm of soft and sparse matter. Consequently, it has spurred many studies on supramolecular systems including molecular dimers, physisorption systems, and polymer bundles [2]. We inve...