Hexane, reaction

Azabicyclo[2.2.0]hexa-2,5-diene, pentakis-(pentafluoroethyl)-synthesis, 2, 304 2-Azabicyclop.2.0]hexadiene reactivity, 7, 360 thermal isomerization, 7, 360 2-Azabicyclo[2.2.0]hexa-2,5-diene synthesis, 2, 304 1 -Azabicyclo[3.2.0]hexadiene synthesis, 7, 361 1 - Azabicyclo[2.2.0]hexane reactions, 7, 344 ring strain... 

Even though cyclohexane is rapidly converted into benzene under these conditions, the results in Figure 3 clearly prove that it cannot be a gas phase intermediate in the n-hexane reaction. If it were, there would have been radioactivity in the unreacted cyclohexane when it was mixed with labeled n-hexane none was observed. This proves that the cyclization step must be further along the reaction stream and must not involve an olefin forming cyclohexane which then dehydrogenates to the aromatics. 

Table VI. Effect of R m VO(OR)2Cl on catalyst activity. Polymerization conditions moiar ratio butadiene, propylene is 1.1, monomer concentration, 31 wt. % in -hexane reaction, — 50°C catalyst, 0.8 mmol VO(OR)2Cl phm, 6.0 mmol i-Bu3Al phm reaction time, 3 h. Data from Ref. 19.

Palladium alloys and their behavior in hexane reactions were already mentioned above. Figure 17 shows that the behavior of neohexane is similar to that of hexane. 

Having proved the synthetic utility of their system, the authors subsequently evaluated a second supported base, 4-dimethylaminopyridine (AO-DMAP) 118, toward the acylation of 2° alcohols (Scheme 30). Employing a premixed solution of phenyl-l-ethanol 119, Et3N 14 and acetic anhydride 37 (0.33, 0.50, and 0.50 M) in hexane, reactions were conducted at room temperature and the effect of residence time evaluated (10-50 s). Using a 60 cm packed bed, the authors were able to obtain near quantitative conversions to 120 employing residence times <20 s, with flow reactions providing superior results to those obtained in analogous batch reactions. 

Another example of secondary shape selectivity is shown by John and co-workers (77,73). They found that the hydroisomerization/hydroeracking of n-hexane over Pt/H-mordenite is significantly inhibited by the presence of benzene. They also found a correlation between the aromatic size relative to zeolite pore size on the inhibition of the hexane reaction and the changes in isomer selectivities. Figure 4 illustrates the relation between the various aromatics co-fed and the n-hexane isomerization rates on H-mordenite. From Figure 4, it is shown that as the kinetic diameter of the aromatics is increased, the isomer formation rate appears to pass through a minimum. This result can be explained by considering the size of the zeolite pore and the kinetic... 

Figure 4. Correlation between relative n-hexane reaction rate and various aromatic co-fed (1.0 refers to pure n-hexane feed).

In this paper, we investigate the influence of catalyst preparation on the reactivity of hydrotaleite-derived Pt/Mg(Al)0 for n-hexane reaction. In specific, the effects of Pt metal incorporation, metal alloying, and adding alkali promoter are examined. 

Table II. Selectivity to Various Products from n-Hexane Reaction over Pt Catalysts at 733 K...

Pyrolysis of the high boiling products obtained from hexene afforded hexanal (Reaction 9a), 2-hexanone (Reaction 9b) and hexenyl acetates (Reaction 9c). 

Figure 2. Silica gel column purification of maduramicin and diamino hexane reaction product. A 2.5 X 40 cm column of Woelm activity grade silica gel was equilibrated with ethyl acetate. The mobile phase was a step gradient of methanol in ethyl acetate. Arrows indicate the concentration of the methanol used. The last peak was eluted with 80% methanol containing 2% triethylamine. Peak a unreacted maduramicin and di-substituted hexane diamine. Peak b mono-substituted hexane diamine.

Z. Liu, D. Jiang, H. Cai, and E. Min, The Hydroisomerization Nature of Ni-substituted Mica Montmorillonite and its Silica Oligomers Pillared Clay in Hexane Reaction. Chem. J. Chin. Univ., 1991, 12, 397-399. 

The test of catalytic behaviour in the n-hexane reactions has been performed in two temperature regions separately. 

More recently, the authors have further extended this work to include a comparison of the Au-Pt(lll) versus Au-Pt(lOO) alloy surfaces in n-hexane reactions (157). As shown in Fig. 12, the same general decreases in reaction rates and increases in isomerization selectivity with Au addition were seen for both Pt surface orientations, except for the fact that, in contrast to Pt(100), the rate of methylpentane production actually increases with Au addition. Other more subtle differences were also observed, demonstrating clearly the existence of structural sensitivity in alloy catalysis. Again, ensemble effects were used to explain the results. 

The feed injected was always 1.0 pi of AR n-hexane. Reaction temperatures from 500°C downward (25°C intervals) were used. Eluted products passed directly to a GC column of length 3.0 m and internal diameter 5 mm packed with 10wt% OV-101 on Chromosorb W of 60-80 mesh. The column temperature was maintained isothermally at 60"C. 

Skeletal w-hexane reaction Pt/CNF 5%Pt/CNF D = 20%) is more active at lower temperature than a commercial 6%Pt/Si02 (EUROPT-1, D = 60%). Both activity and isomer formation are better on Pt/f-CNF than on Pt/p-CNF. 201,343... 

Effect of operational conditions on n-hexane conversion (X), selectivity to Ce isomers (Si) and coke deposition (C) using Pt(h,500)AVZ. n-Hexane reaction WHSV = 4 H2, N2 orN2+H2 n-... 

Yoneda proved that n-hexane reaction selectivity is so different for SbF and HF-SbF catalysts that it is difficult to describe these two reaction systems by a common mechanism involving action. Hence, SbF acts as a Lewis acid. 

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