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Cyclohexane data

Fig. 1.6. Charge distributions in strained cyclic hydrocarbons in comparison with cyclohexane. Data are from K. B. Wiherg, R. F. W. Bader, and C. D. H. Lau, J. Am. Chem. Soc. 109 1001 (1987). Fig. 1.6. Charge distributions in strained cyclic hydrocarbons in comparison with cyclohexane. Data are from K. B. Wiherg, R. F. W. Bader, and C. D. H. Lau, J. Am. Chem. Soc. 109 1001 (1987).
The variance of 10 cyclohexane data sets, each consisting of four observations, are thus calculated and presented below. In this case np4 and HI, 2,...,10 and k=10. [Pg.112]

A complete assignment of the H NMR data for tetrahydropyran (THP) 140 has been reported <1998J(P2)1751>. At room temperature the 400 MHz spectrum of THP in 1 1 CDCl3 CFCl3 consists of three multiplets at S 3.63, 1.64, and 1.57 in a ratio of 2 1 2 (H(2), H(4), and H(3)). At -85 °C, all of the resonances are resolved and the assignment of axial and equatorial protons is possible. This data, in conjunction with the previously reported study of the coupling constants of tetrahydropyran and comparison with cyclohexane data (Table 11) <1976JOC1380>, provide a complete picture of the NMR of tetrahydropyran. [Pg.57]

Calculation of pure component vapor pressure of cyclohexane Data from Perry s... [Pg.371]

Whether or not the conclusion by MacKay and Wolfgang (1962), that the reaction of carbon atoms with ethylene produces an intermediate so highly excited that it fragments to acetylene in a time which is short relative to the time for de-excitation, has general applicability is an open question. It is not supported by the cyclohexane data of Lang and Voigt (1961) and by the data on alkanes. In any event it is clear that generalizations for all systems cannot be made from the limited number of systems studied to date. [Pg.264]

FIGURE 3 Radius of gyration versus T/0 for a (PS) solution in cyclohexane, data after Swislow et al. (1980). [Pg.66]

Electron diffraction measurements suggest that the preferred conformation of cyclohexane is a somewhat flattened chair, with C—C—C bond angles of 111° and torsional angles of 55.9°. For a review of cyclohexane data, see Osawa, E. Collins J. B. Schleyer, P. v. R. Tetrahedron 1977,33,2667. See also Dommen, J. Brupbacher, T. Grassi, G. Bauder, A. /. Am. Chem. Soc. 1990,112,953. For a theoretical analysis, see reference 38. [Pg.124]

Liquid-liquid equilibrium data of polystyrene in cyclopentane and cyclohexane Data extract from Landolt-Bornstein VIII/6D3 Polymers, Polymer Solutions, Physical Properties and their Relations I (Thermodynamic Properties Equilibria of Ternary Polymer Solutions) ... [Pg.254]

To measure the laser position, a method for determining Raman peak positions is needed. Unlike atomic lines, Raman lines have significant spectral width, but they may still be sparsely sampled. Figure 6 shows an example in the low-shift portion of the Raman spectrum of cyclohexane. This spectrum was obtained on a system intended for process monitoring applications. It provides 5-cm resolution. In the vicinity of the 802-cm line of cyclohexane, data points are recorded at about 2.5-cm intervals. This line has been expanded in Fig. 6B to show the sampling that occurs for such a sharp feature. [Pg.277]

Fig. 2.12. Concentration and temperature dependence of the osmotic pressure measured for solutions of PS (Mn = 1-3 10 ) in cyclohexane. Data from Strazielle in Ref. [2]... Fig. 2.12. Concentration and temperature dependence of the osmotic pressure measured for solutions of PS (Mn = 1-3 10 ) in cyclohexane. Data from Strazielle in Ref. [2]...
Fig. 51, Cloud-point curve o a sample of anionic polystyrene in cyclohexane. Data from Rbhage and Wefebs (38). Cloud points O, critical point O coexisting phase compomtions at 2 ( ) and 10(a) % whole polymer concentration... Fig. 51, Cloud-point curve o a sample of anionic polystyrene in cyclohexane. Data from Rbhage and Wefebs (38). Cloud points O, critical point O coexisting phase compomtions at 2 ( ) and 10(a) % whole polymer concentration...
In the next Example, we examine the quality of the acetone-cyclohexane data of Table 13.E. 1. [Pg.462]

Temperature Dependence of UNIQUAC Parameters for Ethanol(1)/Cyclohexane(2) Isothermal Data (5-65°C) of Scatchard (1964)... [Pg.46]

Figure 4-2. UNIQUAC parameters and their approximate confidence regions for the ethanol-cyclohexane system for three isotherms. Data of Scatchard and Satkiewicz, 1964. Figure 4-2. UNIQUAC parameters and their approximate confidence regions for the ethanol-cyclohexane system for three isotherms. Data of Scatchard and Satkiewicz, 1964.
To illustrate, predictions were first made for a ternary system of type II, using binary data only. Figure 14 compares calculated and experimental phase behavior for the system 2,2,4-trimethylpentane-furfural-cyclohexane. UNIQUAC parameters are given in Table 4. As expected for a type II system, agreement is good. [Pg.64]

Type C requires the most complex data analysis. To illustrate, we have reduced the data of Henty (1964) for the system furfural-benzene-cyclohexane-2,2,4-trimethylpentane. VLB data were used in conjunction with one ternary tie line for each ternary to determine optimum binary parameters for each of the two type-I ternaries cyclohexane-furfural-benzene and 2,2,4-... [Pg.75]

The optimum parameters for furfural-benzene are chosen in the region of the overlapping 39% confidence ellipses. The ternary tie-line data were then refit with the optimum furfural-benzene parameters final values of binary parameters were thus obtained for benzene-cyclohexane and for benzene-2,2,4-trimethyl-pentane. Table 4 gives all optimum binary parameters for this quarternary system. [Pg.75]

Calculate, using the data of Fig. III-9a and Eq. III-53, the surface tension versus mole fraction plot for mixtures of cyclohexane and benzene. [Pg.93]

Figure A3.6.11. Viscosity dependence of transmission coefficient of the rate of cyclohexane chair-boat inversion in liquid solution (data from [100]). Figure A3.6.11. Viscosity dependence of transmission coefficient of the rate of cyclohexane chair-boat inversion in liquid solution (data from [100]).
The dimensionality of a data set is the number of variables that are used to describe eac object. For example, a conformation of a cyclohexane ring might be described in terms c the six torsion angles in the ring. However, it is often found that there are significai correlations between these variables. Under such circumstances, a cluster analysis is ofte facilitated by reducing the dimensionality of a data set to eliminate these correlation Principal components analysis (PCA) is a commonly used method for reducing the dimensior ality of a data set. [Pg.513]

Figure 10.8 shows two sets of data plotted according to these conventions, after correction for the effect of interference. In Fig. 10.8a, HC2/T is plotted against C2 for three different fractions of polystyrene in methyl ethyl ketone. Figure 10.8b shows Kc2/Rg versus C2 for solutions of polystyrene in cyclohexane at five different temperatures. These results are discussed further in the following example. Figure 10.8 shows two sets of data plotted according to these conventions, after correction for the effect of interference. In Fig. 10.8a, HC2/T is plotted against C2 for three different fractions of polystyrene in methyl ethyl ketone. Figure 10.8b shows Kc2/Rg versus C2 for solutions of polystyrene in cyclohexane at five different temperatures. These results are discussed further in the following example.
Figure 10.8 Light-scattering data plotted to give slope-intercept values which can be interpreted in terms of M and B. (a) Polystyrene in methyl ethyl ketone. [From B. A. Brice, M. Halwer, and R. Speiser,/. Opt. Soc. Am. 40 768 (1950), used with permission.] (b) Polystyrene in cyclohexane at temperatures indicated. Units of ordinates are given in Example 10.4. [Reprinted with permission from W. R. Krigbaum and D. K. Carpenter,7. Phys. Chem. 59 1166 (1955), copyright 1955 by the American Chemical Society.]... Figure 10.8 Light-scattering data plotted to give slope-intercept values which can be interpreted in terms of M and B. (a) Polystyrene in methyl ethyl ketone. [From B. A. Brice, M. Halwer, and R. Speiser,/. Opt. Soc. Am. 40 768 (1950), used with permission.] (b) Polystyrene in cyclohexane at temperatures indicated. Units of ordinates are given in Example 10.4. [Reprinted with permission from W. R. Krigbaum and D. K. Carpenter,7. Phys. Chem. 59 1166 (1955), copyright 1955 by the American Chemical Society.]...
Fig. 8. Pseudo-binary (solvent-free)jy-x phase diagrams for determining which component is to be the distillate where (—) is the 45° line, (a) No solvent (b) and (c) sufficient solvent to eliminate the pseudo-a2eotiope where the distillate is component 1 and component 2, respectively (51) and (d) experimental VLE data for cyclohexane—ben2ene where A, B, C, and D represent 0, 30, 50, and 90 mol % aniline, respectively (52). Fig. 8. Pseudo-binary (solvent-free)jy-x phase diagrams for determining which component is to be the distillate where (—) is the 45° line, (a) No solvent (b) and (c) sufficient solvent to eliminate the pseudo-a2eotiope where the distillate is component 1 and component 2, respectively (51) and (d) experimental VLE data for cyclohexane—ben2ene where A, B, C, and D represent 0, 30, 50, and 90 mol % aniline, respectively (52).
From the data reported in (63PMH(l)177) it was concluded that hydrophobic substituents reduce the solubility of pyrazole in water (at 20 °C pyrazole, 1 part in 2.5 3,5-dimethyl-pyrazole, 1 part in 52). Another determination gives the following values for the solubilities of pyrazole at 25 °C in water, benzene and cyclohexane (expressed as g/100 g of solvent) 130, 18 and 3 (66AHC(6)347). Indazole is soluble in hot water and most organic solvents, but less so in cold water. [Pg.207]

Testing of plates and other devices is carried out by Fractionation Research, Inc. for industrial sponsors. Some of the test data for sieve plates have been published for the cyclohexane//i-heptane and isobu-tane//i-butane systems. Representative data are shown in Fig. 14-43. These are taken from Sakata and Yanagi Jn.stn. Chem. Engis. Symp. See. No. 56, 3.2/21 (1979)] and Yanagi and Sakata [Jnd. Eng. Chem. Proc. Des. Devel, 21, 712 (1982)]. The column diameter was 1.2 m, tray spacing was 600 mm, and weir height was 50 mm. [Pg.1384]

FIG. 14-74 HETP values for Max-Pak structured packing,. 35 kPa (5 psia), two column diameters. Cyclohexane/n-heptane system, total reflux. For 0.4.3 m (1.4 ft) column perforated pipe distributor, 400 streams/m2, 3.05 m (10 ft) bed height. For 1.2 m (4.0 ft) column tubed drip pan distributor, 100 streams/m ,. 3.7 m (12 ft) bed height. Smaller column data. University of Texas/Austin Larger column data. Fractionation Research, Inc. To convert (ft/s)(lb/ft ) to (m/s)(kg/m ) , multiply by 1.2199. (Couiiesy Jaeger Troducts, Inc., Housion, Texas.)... [Pg.1400]

For substituted cyclohexanes, the slow-exchange condition is met at temperatures below about —50 C. Table 3.5 presents data for the half-life for conformational equilibration of cyclohexyl chloride as a function of temperature. From these data, it can be seen that conformationally pure solutions of equatorial cyclohexyl chloride could be maintained at low temperature. This has been accomplished experimentally. Crystallization of cyclohexyl chloride at low temperature affords crystals containing only the... [Pg.138]

When two or more substituents are present on a cyclohexane ring, the interactions between the substituents must be included in the analysis. The dimethylcyclohexanes provide an example in which a straightforward interpretation is in complete agreement with the experimental data. For 1,2-, 1,3-, and 1,4-dimethylcyclohexane, the free-energy change of the equilibrium for the cis trans isomerization is given below. ... [Pg.142]


See other pages where Cyclohexane data is mentioned: [Pg.579]    [Pg.169]    [Pg.341]    [Pg.579]    [Pg.310]    [Pg.78]    [Pg.579]    [Pg.169]    [Pg.341]    [Pg.579]    [Pg.310]    [Pg.78]    [Pg.45]    [Pg.71]    [Pg.70]    [Pg.140]    [Pg.109]    [Pg.581]    [Pg.410]    [Pg.23]    [Pg.65]    [Pg.146]   
See also in sourсe #XX -- [ Pg.853 ]




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