This open chain structure is challenged in the views put forward by T.
Group is very reactive and behaves in a similar manner to the grouping CO CH 2 CO in open chain compounds, e.g.
OLEFINE, in organic chemistry, the generic name given to open chain hydrocarbons having only singly and doubly linked pairs of carbon atoms. The word is derived from the French olefiant (from olefier, to make oil), which was the name given to ethylene, the first member of the series, by the Dutch chemists, J.
If we accept Kekule's formula for the benzene nucleus, then we may expect the double linkages to be opened up partially, either by oxidation or reduction, with the formation of di-, tetra-, or hexa-hydro derivatives, or entirely, with the production of open chain compounds.
As to the stability of these compounds, most trimethylene derivatives are comparatively unstable, the ring being broken fairly readily; the tetramethylene derivatives are rather more stable and the pentaand hexa-methylene compounds are very stable, showing little tendency to form open chain compounds under ordinary conditions (see Chemistry: Organic).