Cyclooctene trans stereoisomer

So far we have represented cycloalkenes by structural formulas in which the double bonds are of the cis configuration. If the ring is large enough, however, a trans stereoisomer is also possible. The smallest trans cycloalkene that is stable enough to be isolated and stored in a normal way is fran -cyclooctene. 

Cycloalkenes that have trans double bonds m rings smaller than 12 mem bers are less stable than their cis stereoisomers trans Cyclooctene can be isolated and stored at room temperature but trans cycloheptene is not stable above -30°C... 

Assemble a model of trans -cyclooctene. Observe the twisting of the r-bond system. Would you expect the cis stereoisomer to be more stable than tranj-cyclooctene Is m-cyclooctene chiral Is trani -cyclooctene chiral ... 

CM-Cyclooctene ismore stable because it has less strain than the /mn -cyclooctene stmctnre. The relative stability of cycloalkene stereoisomers in rings larger than cyclodecene generally favors trans. The trans-cyclooctene stmctnre is chiral. 

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