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But when Harries named it
"1-5-dimethyl-cyclo-octadien-1-5" any chemist could draw a picture of it
and give a guess as to how it could be made. Even a person without any
knowledge of chemistry can get the main point of it by merely looking at
this diagram:
C C C---C
|| || || |
C--C C C--C C
| | --> | |
C C--C C C--C
|| || | ||
C C C---C
[Illustration: isoprene _turns into_ caoutchouc]
I have dropped the 16 H's or hydrogen atoms of the formula for
simplicity's sake. They simply hook on wherever they can. You will see
that the isoprene consists of a chain of four carbon atoms (represented
by the C's) with an extra carbon on the side. In the transformation of
this colorless liquid into soft rubber two of the double linkages break
and so permit the two chains of 4 C's to unite to form one ring of
eight. If you have ever played ring-around-a-rosy you will get the idea.


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