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Unformatted text preview: 2 -32
( a) cis (b) The cop l an ar atoms i n the structures to the left and below are marked w i th asterisks. (c) H
* �C - C ,
" ,, " T here are sti l l six copl anar atoms. 2 -33 QD M (d)
,, , eH,CH]
* trans C ollinear atoms are marked with asteri sks. 2 -34
( a) no cis-trans i someri sm (b) (c) no c is-trans i someri sm (d) Theoretical l y , cyclopentene could show c i s-trans i somerism. In reality, the trans form is too unstable to exist because of the necessity of stretched bonds and deformed bond angles. trans-CycJopentene has n ever been detected · . c ls " trans "--not possible bec ause of ring strain
/J 0 If/
V (e) t hese are c is- trans i somers , but the designation of c is a nd trans to spec i fic structures is not defined because of four different groups on the double bond 39 ...
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