Decalins,trans

ANISIDINE (m.p. 58) n-Heptane cis-Decalin trans-Decalin Glycerol... 

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 Conditions % cis-DecaUn % trans-Decalin trans/cis ratio... 

Parameters Toluene cis-Decalin trans-Decalin Cyclohexane... 

C14-16 paraffins o-Cresol 1,2-Cyclohexane carbonate p-Cymene cis-Decalin trans-Decalin 1,2-Decane carbonate 1,10-Decanediol n-Decane Decyl alcohol 2-Decyl tetradecanoic acid Diamyl ether ... 

FIGURE 8.4 Examples of some diastereoisomers of different cyclic compounds. 1,2-Dimethylcyclohexane (a, b — enantiomers a, c and b, c — diastereoisomers) (e,e)-(a, a) — (e, a) (e—equatorial a—axial) — conformational diastereoisomers trans-cis — configurational diastereoisomers Decaline trans-cis — configurational diastereoisomers 2-Substituted bicyclo[2.2.1]heptane exo-endo — configurational diastereoisomers. 

---