Bridged Bicycloalkane

A bridged bicycloalkane is a bicycloalkane whose molecule has two carbon atoms shared by all three rings identifiable in the molecule.  The two carbon atoms shared by the three rings are called bridgehead carbon atoms.  A bond or a chain of bonds connecting the bridgehead carbon atoms is called a bridge.

eg. 1:  Decalin

eg. 2:  bicyclo[2.2.1]heptane

If in a bridged bicycloalkane, the bridgehead carbons are directly bonded to each other, the compound is called a fused bicycloalkane. In other words, in a fused bicycloalkane, the number of carbon atoms in one of the three bridges is zero. eg: decalin

see also spirobicycloalkane

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