Cyclopentane Hexane

Thermal rearrangement of trans-l,2-dibromo compounds is known in the literature (refs. 6-10). In all case studies only one pair of bromine in each organic molecular was studied. Bellucci (ref. 10), for example, studied the kinetics of such trans-l,2-cyclo alkanes as cyclopentane, hexane, octane, etc. The intermediates suggested as an explanation for the experimental results are bromonium bromide I in polar solvents and four center transition state II in non-polar solvents. 

Methylcyclohexanol, see Methylcyclohexane Methylcyclopentane, see Benzene, Cyclohexane, Cyclopentane, Hexane Methyl diazene, see 1,1-Dimethylhydrazine Methyldibenzofuran, see Pyrene Methyl 5-(2,4-dichlorophenoxy)anthranilate, see Bifenox... 

A broad range of solvents (cyclopentane, hexane, cyclohexane, methylcy-clohexane, toluene, xylene, dichloromethane, chloroform, carbon tetrachlo-... 

Nitrile Hydratase/Amidase Catalyzed Stereoselective Transformation of cis- and frans-N-Protected-P-amino-cyclopentane/ hexane Nitriles... 

Die Elektrolyse von 1-Chlor (bzw. Brom, Jod)-l-phenyl-l-hexin liefert in Abhangig-keit vom Kathodenpotential verschiedene Produkte. So wird z.B. bei -2,85 V ausschlieB-lich 1 -Phenyl-hexan erhalten, bei anderen Potentialen fallen Gemische von 1-Phenyl-cy-clohexen, Benzyl-cyclopentan und l-Phenyl-hexen-(5)-in-(l) an. l-Brom-5-decin liefert bei -2,7 V neben 5-Decin (59% d.Th.) 1 -Butyl-cyclohexen (38% d.Th.)1. 

Identity of peaks (1) propane (2) iso -butane (3) n-butane (4) butene-1, butene-2 (5) iso-pentane (6) n-pentane (7) 2-methyl-l -butene (8) 2 -methyl pentane (9) 3-methyl pentane (10) n-hexane (11) methyl cyclopentane (12) benzene... 

The neurotoxicity of pure M-hexane (99%) has been compared to mixed hexanes (a mixture containing the -hexane isomers 2-methylpentane, 3-methylpentane, cyclohexane, methyl cyclopentane, and 2,3-dimethyl butane with approximately 1% -hexane) (IRDC 1981). The mixture was intended to be more representative of products used commercially. In this experiment, groups of Sprague-Dawley rats were exposed to -hexane alone (500 ppm), mixed hexanes (494 ppm) or -hexane plus mixed hexanes (992 ppm) daily for 6 months, 22 hours a day. No deaths occurred as a result of treatment. 

Non-polar solvent Hexane Heptane Isooctane Cyclohexane Cyclopentane Carbon disulfide Carbon tetrachloride Benzene... 

FIGURE 3 2 Solvent extraction efficiencies (EF) as functions of dielectric constants (D), solubility parameters (6), and polarity parameters (P and E -). Solvents studied silicon tetrachloride, carbon disulfide, n pentane. Freon 113, cyclopentane, n-hexane, carbon tetradiloride, diethylether, cyclohexane, isooctane, benzene (reference, EF 100), toluene, trichloroethylene, diethylamine, chloroform, triethylamine, methylene, chloride, tetra-hydrofuran, l,4 dioxane, pyridine, 2 propanol, acetone, ethanol, methanol, dimethyl sulfoxide, and water. Reprinted with permission from Grosjean. ... 

Note According to Chevron Phillips Company s (2005) Technical Data Sheet, 99.0-99.4 wt % n hexane (pure grade) contains the following compounds 3-methylpentane (0.1 wt %), methyl-cyclopentane (0.4 wt %), and 2,4-dimethylpentane (0.1 wt %). 

Miscible in many hydrocarbons including cyclopentane, methylcyclopentane, cyclohexane, hexane, and 2-methylhexane. 

Cheng, K.-W., Chen, J.-W., Tang, W., and Chen, Y.-P. Vapor-liquid equilibria of binary mixtures cyclopentane + isopropyl acetate, isopropyl acetate -r hexane, and cyclopentane -r methyl methacrylate at 101.3 kPa, J. Chem. Eng. Data, 42(4) 754-757, 1997. 

Because cyclopentane is not sufficiently stable to occur naturally in large quantities, most exposures involve a mixture of substances. In the Italian shoe industry, exposure to glue solvents containing up to 18% cyclopentane has been associated with polyneuropathy. However, it is assumed that -hexane is present in these solvents and accounts for the polyneuropathy. 

Borsig E, Lazar M, Capla M (1967) Polymerization of methyl methacrylate initiated by 3,3,4,4-tetraphenyl hexane and 1,1,2,2-tetraphenyl cyclopentane. Makromol Chem 105 212... 

The yield determined in a certain type of experiment usually strongly depends on the assumptions made about the formation mechanism. In the older literature, the excited molecules were often assumed to be produced solely in neutral excitations [127,139-143] and energy-transfer experiments with Stern-Volmer-type extrapolation (linear concentration dependence) were used to derive G(5 i). For instance, by sensitization of benzene fiuorescence, Baxendale and Mayer established G(5 i) = 0.3 for cyclohexane [141]. Later Busi [140] corrected this value to G(5 i) = 0.51 on the basis that in the transfer, in addition to the fiuorescing benzene state S, the S2 and S3 states also form and the 82- 81 and 83 81 conversion efficiencies are smaller than 1. Johnson and Lipsky [144] reported an efficiency factor of 0.26 0.02 per encounter for sensitization of benzene fluorescence via energy transfer from cyclohexane. Using this efficiency factor the corrected yield is G(5 i) = 1.15. Based on energy-transfer measurements Beck and Thomas estimated G(5 i) = 1 for cyclohexane [145]. Relatively small G(5 i) values were determined in energy-transfer experiments for some other alkanes as well -hexane 1.4, -heptane 1.1 [140], cyclopentane 0.07 [142] and 0.12 [140], cyclooctane 0.07 [142] and 1.46 [140], methylcyclohexane 0.95, cifi-decalin 0.26 [140], and cis/trans-decalin mixture 0.15 [142]. 

Figure 7 G(Si) value as a function of the carbon atom numbers in the molecules. When more than one measured value was published, we tried to select the most probable value. Alkanes (1) propane, (2) w-butane, (3) w-pentane, (4) cyclopentane, (5) w-hexane, (6) cyclohexane, (7) w-heptane, (8) cycloheptane, (9) methylcyclohexane, (10) w-octane, (11) cyclooctane, (12) isooctane, (13) w-decane, (14) cyclodecane, (15) cw-decalin, (16) trawx-decalin, (17) w-dodecane, (18) dicyclohexyl, (19) n-hexadecane. (From Refs. 18, 29, 65, 92, 148, and 155.)...

CH,),- 3-(Nitro-phthalimido-methyl)-I-oxo- cyclopentan 47-68 96-103 (Hexan/Ether)... 

In early measurements the solubility of [C2CiIm][PFg] in aromatic hydrocarbons (benzene, toluene, ethylbenzene, o-xylene, m-xylene, and p-xylene) and that of [C4QIm][PFg] in the same aromatic hydrocarbons, and in n-alkanes (pentane, hexane, heptane, and octane), and in cyclohydrocarbons (cyclopentane and cyclohexane) has been presented [96]. 

Earlier work on the exchange of methylcyclopentane and methylcyclo-hexane over nickel catalysts at 150°-200° had not shown any discontinuities in the distribution pattern of the products (S9). There was a uniform rise up to a maximum for the fully deuterated species. This is not surprising, since similar behavior was noted with cyclopentane and cyclohexane under the same conditions. At these high temperatures the interchange reaction occurs sufficiently readily to mask any division of the hydrogen atoms into sets. 

Fig. 5. Rate of H—D exchange versus ionization potential of alkanes and aromatic compounds 1 = methane 2 = ethane 3 = propane 4 = n-butane 5 = n-pentane 6 = n-hexane 7 = cyclopentane 8 = cyclohexane 9 = benzene 10 = naphthalene 11 = phenanthrene 12 = 2,2-dimethylbutane (see text) 13 = 1,1-dimethylpropy I benzene (see text) 14 = 2-methylpropane 15 = 2-methylbutane 16 = 2,2-dimethylpropane 17 = 2-methylpentane 18 = 3-methylpentane 19 = 2,3-dimethylbutane 20 = 2,2-dimethylbutane.

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