Cis-Decalins

Furthermore, while no significant difference in the product distribution, with the exception of the trans-decalin/cis-decalin ratio, is observed for the tested proton-form zeolites, dissimilarity between Pt/H-Y on one hand and both Pt/H-Beta zeolites on the other hand is found (Figure 6). More ROP and CP, accompanied by less Iso, are formed on Pt/H-Y than on Pt/H-Beta zeolites. This implies that the consecutive ring opening and cracking are faster over Y-zeolite than over Beta-zeolites resulting in lower concentration of isomers and higher concentrations of ROP and CP. 

Tetralin. Therefore, either trans-Decalin was formed on the surface of the coal with deuterium from the solvent or gas, or it was formed by isomerization from cis-Decalin with accompanying isotopic exchange with a deuterium source. Because the protium content of the cis-Decalins is much greater than the trans-Decalins, cis-trans isomerization is not very important. 

Onboard hydrogen required for 500 km cruise is estimated to be 5 kg, amounting to 77.7 L of commercial decalin (cis/trans = 1) and 104.1 L of methylcyclohexane in volume, which corresponds to 1.09 and 1.52 times of the required amount of liquefied hydrogen (70.6 L), respectively. 

Perfluoro- 1,3- dimethyl- cyclohexane Perfluoro- n-octane Perfluor- decaline (cis+trans Isomere) Perfluoro- perhydro- phenan- threne... 

Two bicycloalkane isomers, cis- and trans-bicyclo[4.4.0]decane (decalin cis-, trans-91) have been the focus of investigation by both radiolysis [237] and photo-... 

Heats of isomerization can be calculated directly from the equilibrium constants for the reactions shown above because there are no changes in symmetry and the other conformational isomers (boat conformations) of sufficient stability to introduce significant entropy-of-mixing terms. The liquid-phase heats of isomerization in Table XX for aa ial-l-methyl-fm s-decalin (cis-anti isomer) to equa-anti isomer) decrease at lower temperature consistent with the greater volatility of the more stable isomer, appropriate to the 5° difference in boiling points. At the highest experimental temperature, the liquid-phase heats of isomerization closely approach the 2.10 kcal/mole observed in the vapor phase. The analytical data are in Table XXI. 

Catalyst Reaction Conditions % trans-Decalin % cis-Decalin % Others trans-D/cis-D Ratio... 

Other examples are 1,2,4,5-tetramethylcyclohexane, hexamethylcyclohexane, ds-decalin, cis-syn-cis-perhydroanthracene 32 and tetracyclohexylethane. After... 

The further, conformationally restricted isomaltose analogues (38) and (39) were prepared by glucosylation using 2,3,4,6-tetra-0-benzyl-Z>-glucosyl acetate and TMS triflate as catalyst, and the tran5-decalin cis-diol. The products were obtained in the proportions 83 5 with 12% of /3-linked products. ... 

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