Hexene cyclohexane

Hexane Hexenes Cyclohexane Cyclohexene Hexa- dienes 1,3-Cyclo- hexadiene Trans-, 5,S- hexatriene Benzene... 

Butene from 1-butene, isobutene, cis- and trans-2-butene KX 1-Hexene/ cyclohexane [147, 148]... 

Systematic transmission spectroscopic studies of the transformations were carried out on the systems allene, propene, cyclopropane, zsopropanol and acetone over NaM,HM and NaHM [113-117], 1-butene over NaHY [117,118], allene, propene and cyclopropane over NaHY and NaHZSM-5 [116,117,119-122],neopentane over NaY, NaHY,NaHM and NaHZSM-5 [119,123,124],cyclohexene over HZSM -5 [ 119], 1 -hexene, cyclohexane, cyclohexene, cyclohexadiene and benzene over NaHY and NaHZSM-5 [117,125], allyl alcohol, acrolein and allene over HZSM-5 [ 126], allene and propyne over nonacidic zeohtes NaA, CoNaA, CoNaX, NaY and NaHY [121] and benzene, toluene, ethylbenzene, and cumene over HZSM-5 [127]. 

The reaction hexenes —> hexadienes was demonstrated without using radiotracers both on oxide and metal catalysts, Nil 1 and Ptj l Mixtures containing [ " CJ-hexene contributed to the clarification of the further reaction pathway. These studies showed that neither the hexene cyclohexane nor the hexene —> cyclohexene ring closure pathway took place.Table 2 indicates that radioactivity appeared in both the hexatriene and 1,3-cyclohexadiene fractions when their inactive form was admixed to radioactive hexene. The aromatisation of both inactive components was much more rapid than that of hexene, therefore their specific radioactivities showed very low absolute values, however, these were still higher than that of benzene produced mainly from these non-radioactive precursors. The true precursor of ring closure should have been cis-cis-1,3,5-hexatriene. Its ring closure takes place without any catalyst from 513 The stepwise dehydrogenation of open-chain hydrocarbons produces cis- and trans-isomers of alkenes and alkadienes. Any c s-c s-triene... 

The second aromatization reaction is the dehydrocyclization of paraffins to aromatics. For example, if n-hexane represents this reaction, the first step would be to dehydrogenate the hexane molecule over the platinum surface, giving 1-hexene (2- or 3-hexenes are also possible isomers, but cyclization to a cyclohexane ring may occur through a different mechanism). Cyclohexane then dehydrogenates to benzene. 

Infrared spectrum, benzaldehyde, 730 butanoic acid, 771 cyclohexane., 436 cyclohexanol, 633 cyclohexanone, 730 cyclohexene. 436 cyclohexylamine, 952 diethyl ether, 671 ethanol, 421 hexane. 424 1-hexene, 424 1-hexyne, 424 phenol, 633... 

The synthesis of the trisubstituted cyclohexane sector 160 commences with the preparation of optically active (/ )-2-cyclohexen-l-ol (199) (see Scheme 49). To accomplish this objective, the decision was made to utilize the powerful catalytic asymmetric reduction process developed by Corey and his colleagues at Harvard.83 Treatment of 2-bromocyclohexenone (196) with BH3 SMe2 in the presence of 5 mol % of oxazaborolidine 197 provides enantiomeri-cally enriched allylic alcohol 198 (99% yield, 96% ee). Reductive cleavage of the C-Br bond in 198 with lithium metal in terf-butyl alcohol and THF then provides optically active (/ )-2-cyclo-hexen-l-ol (199). When the latter substance is treated with wCPBA, a hydroxyl-directed Henbest epoxidation84 takes place to give an epoxy alcohol which can subsequently be protected in the form of a benzyl ether (see 175) under standard conditions. 

The cyanobacteria Anflfcflenfl sp. strain PCC 7120 andNostoc ellipsosporum dechlorinated y-hexachloro[flflfleee]cyclohexane in the light in presence of nitrate to y-pentachlorocyclo-hexene (Figure 2.5), and to a mixture of chlorobenzenes (Kuritz and Wolk 1995). The reaction is dependent on the functioning of the nir operon involved in nitrite reduction (Kuritz et al. 1997). 

From these data, some key information can be drawn in both cases, the couple methane/pentane as well as the couple ethane/butane have similar selectivities. This implies that each couple of products (ethane/butane and methane/pentane) is probably formed via a common intermediate, which is probably related to the hexyl surface intermediate D, which is formed as follows cyclohexane reacts first with the surface via C - H activation to produce a cyclohexyl intermediate A, which then undergoes a second C - H bond activation at the /-position to give the key 1,3-dimetallacyclopentane intermediate B. Concerted electron transfer (a 2+2 retrocychzation) leads to a non-cychc -alkenylidene metal surface complex, C, which under H2 can evolve towards a surface hexyl intermediate D. Then, the surface hexyl species D can lead to all the observed products via the following elementary steps (1) hydrogenolysis into hexane (2) /1-hydride elimination to form 1-hexene, followed by re-insertion to form various hexyl complexes (E and F) or (3) a second carbon-carbon bond cleavage, through a y-C - H bond activation to the metallacyclic intermediate G or H (Scheme 40). Under H2, intermediate G can lead either to pentane/methane or ethane/butane mixtures, while intermediate H would form ethane/butane or propane. 

Hexene and cyclohexane have the same molecular formula (C6H12) ... 

Radiotracer experiments gave final proof of the reaction pathway. The mixture of C-labeled n-hexane with inactive 1-hexene was reacted over platinum catalyst. The same was done with the mixture of labeled n-hexane and inactive cyclohexane (52-54). 

Comparative results are shown in Table I. A considerable increase in n-hexene radioactivity is observed, whereas no radioactivity appeared in cyclohexane. 

These results indicate the formation of 1-hexene from -hexane in both helium and hydrogen. The absence of cyclohexane is due to the lack of its formation and not to its rapid further reaction to benzene. The rate of hexene aromatization is more rapid than that of hexane (52, 54). 

Similar experiments showed that neither cyclohexane nor cyclohexene is formed from labeled 1-hexene. However, the formation of 1,3,5-hexatriene... 

Radiotracer Studies with the Mixtures of C Labeled n-Hexane with Nonradioactive I-Hexene and Cyclohexane 54)... 

If various feeds give the same TPR spectrum for their end product, a common rate determining step can be assumed. This was the situation when TPR spectra of benzene formed over Pt-AljOj from adsorbed n-hexane, 1-hexene, and 1,5-hexadiene were studied. This re-confirms the hexane-hexene-hexadiene stepwise mechanism since cyclohexane, cyclohexene, and cyclohexadiene gave another type of TPR spectrum (62b). 

Benzazimide, see Azinphos-methvl Benzene, see Chlorobenzene, Cyclohexane, Diallate, Diethyl phthalate, Hexachlorobenzene, 1-Hexene, Lindane, Pentachlorobenzene, Styrene, Triallate. 1,2,3-Trichlorobenzene... 

Hydrocarbon bond saturation and cyclization also play roles in water solubility. Figure 6.7 shows that, among the six-carbon hydrocarbons, the various forms of hexane, C6H14, have the lowest solubility, and the hexenes and cyclohexane with the formula C6H12 have three times the solubility. Fewer hydrogen atoms consistently lead to higher solubilities, and benzene has one hundred times the water solubility of normal and iso-hexanes. 

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