Selected Tables

TABLE 29-10 Typical Steam-Turbine Selection Table... 

Table 12.4 Selection table for switches, fuses, relays and cables for different sizes of LT motors...

Employing protocol V with the methanesulfonamide catalyst 122, a 93 7 er can be obtained in the cyclopropanation of cinnamyl alcohol. This high selectivity translates well into a number of allylic alcohols (Table 3.12) [82]. Di- and tri-substi-tuted alkenes perform well under the conditions of protocol V. However, introduction of substituents on the 2 position leads to a considerable decrease in rate and selectivity (Table 3.12, entry 5). The major failing of this method is its inability to perform selective cyclopropanations of other hydroxyl-containing molecules, most notably homoallylic alcohols. 

To illustrate the effect of the pressure drop on the reboiler selection. Table 10-34 compares several designs for the same heat load and quantity of reboiled vapor. 

Estimate of current required The surface area of the structure is calculated and the current density required for the particular environment is selected (Table 10.26). In the case of an existing structure the condition of the coating may be unknown and the application of a temporary cathodic-protection system may be necessary to determine the amount of current required for protection, as established by the potential. Such a test to determine the... 

The observation that addition of imidazoles and carboxylic acids significantly improved the epoxidation reaction resulted in the development of Mn-porphyrin complexes containing these groups covalently linked to the porphyrin platform as attached pendant arms (11) [63]. When these catalysts were employed in the epoxidation of simple olefins with hydrogen peroxide, enhanced oxidation rates were obtained in combination with perfect product selectivity (Table 6.6, Entry 3). In contrast with epoxidations catalyzed by other metals, the Mn-porphyrin system yields products with scrambled stereochemistry the epoxidation of cis-stilbene with Mn(TPP)Cl (TPP = tetraphenylporphyrin) and iodosylbenzene, for example, generated cis- and trans-stilbene oxide in a ratio of 35 65. The low stereospecificity was improved by use of heterocyclic additives such as pyridines or imidazoles. The epoxidation system, with hydrogen peroxide as terminal oxidant, was reported to be stereospecific for ris-olefins, whereas trans-olefins are poor substrates with these catalysts. 

In contrast to ordinary chiral aldehydes (having no ability to be chelated), the reaction of 9-allyl-9-borabicyclo[3.3.1]nonane(allyl-9-BBN) with the corresponding chiral imines 4 produces the isomer syn-6 either exclusively or predominantly (Cram selectivity Table 8)5,6. The very high 1,2-asymmetric induction is explained by a six-membered. chair-like transition state, in which the inline R group occupies an axial position due to the stereoelectronic effect of imines (R CH = NR). 

The partial pressures of 0, C>2, Pu, PuO, and Pu02 were calculated as functions of T (1500 T 4000 K) and x (0.005 x 0.30), with particular emphasis on 0.005 x 0.10. Preliminary calculations at 5000 K yielded unreasonably high oxygen pressures and vapor densities such that an upper temperature limit of 4000 K was selected. Tables presenting selected results are given In ANL-CEN-RSD-82-1 (21). 

A modification of the Hammett approach, suggested by Brown, called the selectivity relationship is based on the principle that reactivity of a species varies inversely with selectivity. Table 11.3 " shows how electrophiles can be arranged in order of selectivity as measured by two indexes (1) their selectivity in attacking toluene rather than benzene, and (2) their selectivity between the meta and para positions in toluene. As the table shows, an electrophile more selective in one respect is also more selective in the other. In many cases, electrophiles known to be more... 

The smoke analysis of cigarettes made from the same tobacco blend, but with and without filter tips revealed that cellulose acetate retains TSNA selectively (Table VIIl). This phenomenon is clearly established for a large number of filter cigarettes. 

OS 40] [R 20] [R 21] [P 28] Various side products were formed during the reactions, each typically not exceeding 5% [48]. The formation of side products decreases with increasing flow rate, i.e. providing a longer residence time than kinetically needed decreases selectivity (Table 4.4). 

Acrobat 4.0 has a table/formatted text select tool that allows one to select tables and text in a PDF document and retain the original formatting when the material is... 

Click Next, and a file browser window will open that allows for the drill-down and selection of the Microsoft Excel file of interest. Once the file is selected, a Select Table window will open. This window allows you to pick which worksheet in the Excel file you want to turn into a SAS data set. Click the Options button to see the new options available with SAS 9.1 and PROC IMPORT. 

Note that the default options were chosen in the preceding window. We will look at those further when we explore the subsequent PROC IMPORT code. Now, click OK in the Spreadsheet Options window and then click Next in the Select Table window. The Select Library and Member window opens, which allows for the selection of a SAS library and data set name as follows. 

After you click Next, a Select Table window pops up, allowing you to enter a name for your Excel worksheet. We call the worksheet DM in this example, as follows ... 

Reports on homogeneous catalysis did not underline the recyclability of the catalysts. The supported catalysts were recycled without any significant loss of activity and selectivity Table 4 presents the recycling results for the first 3 runs using the substrate la in the presence of both catalysts. The supported catalytic system can easily be separated by centrifugation under ambient conditions without any additional treatment. 

As pointed out by Hosoya et al.92 the enantiofacial selection of ra-olefins is mainly controlled by the asymmetric centers at the C-8(8 ) carbons, while that of trans-olefins is preferentially controlled by the asymmetric centers at the C-9(9 ) carbons in 119 or 120. Optically active Mn(III)-salen complexes have catalyzed the epoxidation of m-olelins with higher ee (>90%), especially when they are conjugated with an acetylene or phenyl group. However, the epoxidation of trans-olefins with these salen complexes shows rather poor enantio-selectivity (Table 4-18). 

The alcohols are intermediates in the formation of ketones. Isomerization of the products is not observed. Hydroxylation at the 2-position is favored over that at the 3-position, and the latter is preferred over hydroxylation at the 4-position. Solubility and concentration in the reaction medium, intrazeolite diffusion of the reactants, steric hindrance at the reactive carbon center, and C-H bond strength influence the reactivity and H202 selectivity (Table XXIV). The advantage of the large-pore Ti-beta over TS-1 in the oxidation of bulky alkane molecules is shown by the results in Table XXV. 

The minimum amount of catalyst needed to obtain maximum selectivity was determined to be 5 mol%. Larger quantities had no effect. Consistent with other literature reports[17], very small quantities of water (5 mol% = 2.5 mg E O/g 3) lowered the selectivities (Table 11.6, entry 4). Water sensitivity required thorough drying of the equipment, the starting materials and the solvents. In the case of tetrahydrofuran, drying was achieved by using activated 5 A molecular sieves (KF titration >0.005%). On the other hand, solvents used for crystallization of the starting material (3), such as 2-propanol and acetonitrile showed little effect on the enantioselectivities of the reaction (entries 6 and 7). 

The ureidocarbonylation reaction provides access to hydantoins containing diverse substituents in the 1-, 3-, and 5-positions with good selectivities (Table 2) [37]. With monosubstituted ureas, 3-substituted hydantoins are obtained. 

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