Factors governing choice

Table 5. Factors Governing Choice of Regeneration Method ...

Displacement damage function, 14 436 Displacement desorption, factors governing choice of method, l 614t Displacement plating, 24 141 Displacements per atom (dpa), 14 436 Displays... 

Factors governing choice of protecting groups / 375 Factors governing selectivity in formation of protecting groups / 375... 

TABLE 1. FACTORS GOVERNING CHOICE OF REGENERATION METHOD... 

Table 7.5 Factors governing choice of regeneration method 15]. Reproduced with permission of the American Institute of Chemical Engineers. Copyright 1988, AIChE. All rights reserved.

The various items of equipment in the production facility are connected hy valves, fittings, and piping to enable and control flow from one piece of equipment to another. Chapter 9 of Volume 1 discusses factors governing the choice of line size and wall thickness. This chapter describes the various types of valves and fittings commonly used in production facilities and presents some common piping details and specifications. 

Other Factors Governing the Choice between Zinc and Cadmium... 

All therapeutically active agents in the nitrate group have identical mechanisms of action and similar toxicities. Therefore, pharmacokinetic factors govern the choice of agent and mode of therapy when using the nitrates. 

The three common methods of regeneration arc thermal swing, pressure swing, and displacement. The main factors governing this choice are summarized in Tabic 1. 

Semi-empirical NDDO methods have been used for the study of various heterocycles <1995JMT51>. A belief that highly accurate values are not essential for valid conclusions to be drawn and the time advantage of semi-empirical over ab initio methods were factors governing the choice of these procedures. In general, there is reasonable agreement between structures and energies computed and experimental or ab initio values. The semi-empirical structural data have been discussed and compared with previously determined structures (Table 1). 

On irradiation / -quinones undergo cycloaddition with alkenes to give oxetanes or cyclobutanes the major factor governing the choice of product seems to be the electronic character of the lowest triplet excited state of the quinone. 

The choice of deblocking amine strongly depends on the nature of the reaction system. For instance, the volatility of DEA or dimethylamine represents an advantage in peptide synthesis in solution.The bulky character of diisopropylamine can be exploited for the selective removal of Fmoc protection in the presence of phthalimido residues which are sensitive to piperidine.P l Consideration must also be given to possible subsequent reactions of the deprotected amine group with the initially formed byproduct dibenzofulvene. The factors governing the rates of adduct formation are still not completely understood, but both... 

Dialkyl cyanomethylphosphonates are routine reagents readily accessible on laboratory scale and also available from a number of chemical suppliers. Since the review by Pudovik and Yastrebova published in 1970, ° the use of dialkyl cyanomethylphosphonates in Homer-Wadsworth-Enunons reactions has been covered in several comprehensive and excellent reviews. AU the factors governing the reaction (nature of the carbanions and carbonyl group, reaction conditions, mechanism, and stereochemistry) have been studied in depth. We invite the reader to refer to these papers. In contrast, we discuss here the synthetic applications resulting directly from the use of dialkyl cyanomethylphosphonate, which is the pathway of choice for the preparation, via a,p-unsaturatcd nitriles, of a,P-unsaturated aldehydes, cyanoethyl compounds, allylamines, and saturated amines. 

Besides the factors governing the choice of the catalyst that were discussed earlier, various other factors affect the reactivity of a PT catalyzed reaction. These include choice of organic solvent and anion, catalyst structural factors that determine the distribution of anion between the organic and aqueous phases, degree of hydration of anions, and so on (Landini et al., 1978 Herriot and Picker, 1975). These are reviewed in detail by Starks et al. (1994) and Dehmlow and Dehmlow (1993), and are only briefly discussed here. Since the PTC cycle is a multistep process, factors affecting each step and inter-relationships between steps are important. It is necessary to understand the factors that cause one anion to be taken into the organic phase hy more or less readily than a second anion. Also, once transferred, the anion should... 

In semi-arid regions (rainfall less than about 20 inches) where moisture is commonly the limiting factor in crop production, and the main factor governing the choice of crop... 

In most complex-equilibrium investigations in solvent mixtures, the choice of the solvent was determined by the solubilities of the components of the system. The aim of the investigations, therefore, was not the detection of the solvent effect, but the determination of the compositions and stabilities of the complexes formed in solution, and possibly some of the factors governing these. Relatively little attention has been devoted to the study of the solvent effect in solvent mixtures. 

On the basis of kinetic studies [75-77], Smith suggested that the major factors governing the choice of two alternative metabohc routes are the first-and zero-order rate constants of the two reactions. The first-order rate constant in conjugation reactions may not be subject to serious species variations, but the zero-order rate constant depends not only on the mobihzation rate of glycine, glucuronic acid, etc., which is different in different species, but also on the compound metabohzed. The compound may affect the zero-order rate constant either by virtue of its tissue level, which depends on dose, or by its effect on the maximum velocity of the enzymatic reaction [23]. 

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