Bridge Rings compounds

Bridged ring compounds refer to ring compounds in which any two rings share two or more carbon atoms. They are classified into bicyclic hydrocarbons, tricyclic hydrocarbons, tetracyclic hydrocarbons, etc. according to the number of constituent rings. The carbon atoms used by two or more rings are called bridgehead carbon atoms, and the bond connecting the bridgehead carbon atoms is called a bridge. Bridged ring structures are widely present in nature, such as alkaloids, steroid compounds, terpenoid compounds, etc.