Basic activation

The C02 chemisorption results reveal that the equivalent of only 1.6% of the Cs present on the catalyst is an active basic site, accounting for the low reaction conversions observed. C02-TPD shows that the basic sites that do exist are weak, with desorption peaks observed at 373 and 437 K. An investigation into Cs-promoted a-NiM04 catalysts by Madeira et al. [10] demonstrated with C02-... 

X-CW divinylbenzene polymer exchange, hydrogen bond donor and acceptor, and reversed phase activities basic drugs (94)... 

SokolieP, T., Koller, G. Approach to method development and vahdation in capillary electrophoresis for enantiomeric purity testing of active basic pharmaceutical ingredients. Electrophoresis 2005, 26, 2330-2341. 

The male reproductive system includes the two testes, ducts that store and transport the sperm to the exterior, and the glands that secrete into these ducts and the penis it also includes the hormones that integrate the reproductive activities. Basic details of the anatomy of the male reproductive system are given in Figures 19.1 and 19.2. 

An investigation of the influence of the pre-treatment temperature of the MgO and CaO catalysts showed that MgO exhibited low activity at any pre-treatment temperature, whereas CaO exhibited excellent activities when pre-treated at 673 and 873 K. However, both catalysts exhibited no activity when pre-treated at temperatures below 573 K, which indicates that the active basic sites for this transformation are not OH groups, but rather 0 ions on the MgO surface. 

The rearrangement occurs more readily when activating groups (aryl, carboxyl, etc.) are attached to the triple bond. Jacobs [38] reports that a reaction involving adsorption of an acetylenic compound on an active basic surface has led to the practical synthesis of arylallenes, allenyl ethers, allenyl halides, and other substituted allenes. 

The cephalosporins are semisynthetic -lactams derived from cephalosporin C, a natural antibiotic. Their active basic nucleus consists of a six-membered dihydrothiazine ring fused to a -lactam ring (Fig. 3.3.2). Cephalosporins have some desirable quality characteristics that are generally deficient in penicillins. The popularity and usefulness of cephalosporins results from their resistance to many... 

Benzyl bromide was obtained from Aldrich Chemical Company, Inc., and purified by passage through 5 g of activated basic aluminum oxide. 

Figure 6. Mechanistic pathway for the proposed enhancing effect of carbon dioxide in the alkylation of acetonitrile over the active basic sites...

Basic Protocol 1 Titrimetric Determination of Lipase Activity Basic Protocol 2 Colorimetric Assay of Lipase Activity Using the Copper Soap Method... 

A novel microwave-mediated three-component coupling of a-acyl bromides, pyridine and internal alkynes was carried out in the absence of a solvent on activated basic alumina to provide a collection of indolizines (Scheme 3.5)7. It was proposed that the reaction proceeded via in situ generation of a dipole from an N-acyl pyridinium salt, followed by a [3+2] cycloaddition reaction. A dedicated laboratory microwave system was... 

The cellosolve and carbitol solvents may contain traces of peroxide. These can be removed either by heating under reflux over anhydrous tin(n) chloride (see 11. Propan-2-ol) or by filtration under slight pressure through a column of activated basic alumina (Grade I) the used alumina should be saturated with water before being discarded. 

Gilani AH, Khan AU, Ghayur MN, Ali SF, Herzig JW. 2006. Antispasmodic effects of Rooibos tea (Aspalathus linearis) is mediated predominantly through K + -channel activation. Basic Clin Pharmacol Toxicol 99 365-373. 

The concentration of drug in plasma is due to three factors the rate of drug input (rate of infusion) the rate of elimination and the volume of distribution. Since the rate of input is a constant, only a change in the rate of elimination or volume of distribution emerge as possible reasons for such an unusual finding. It is possible that the volume of distribution changes over time. It is also possible that tasidotin is distributed by a transporter that must be activated. Basically, with this... 

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