The two bond cleavages shown convert camphene to a noncyclic species; therefore, camphene isbicyclic. (Other pairs of bond cleavages are possible and lead to the same conclusion.)3.13(b)This bicyclic compound contains nine carbon atoms. The name tells us that there is a fve-carbon bridge and a two-carbon bridge. The 0 in the name bicyclo[5.2.0]nonane tells us thatthe third bridge has no atoms in it—the carbons are common to both rings and are directlyattached to each other.(c)The three bridges in bicyclo[3.1.1]heptane contain three carbons, one carbon, and one carbon.The structure can be written in a form that shows the actual shape of the molecule or one thatsimply emphasizes its constitution.(d)Bicyclo[3.3.0]octane has two fve-membered rings that share a common side.3.14
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