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Bridged compounds are compounds which contain interlocking rings. Examples include: * Adamantane * Amantadine * Biperiden * Memantine * Methenamine * Rimantadine * Norbornane ==Nomenclature== The nomenclature of bridged compounds was established by the von Baeyer system. Some important concepts for bridged compounds are: * ''Bridgehead'': Any skeletal atom of the ring system which is bonded to three or more skeletal atoms (excluding hydrogen). In consequence, the bridgeheads are always tertiary or quaternary carbons. For insaturations, Bredt's rule states that a double bond cannot be placed at the bridgehead of a bridged ring system, unless the rings are large enough. * ''Bridge'': Unbranched chain of atoms or an atom or a valence bond connecting two bridgeheads. They may consist in carbon or heteroatoms. (Excluding hydrogen) * ''Main ring'': Ring identified as the pattern structure. * ''Main bridge'': Bridge which connects the two bridgeheads in pattern structure. * ''Secondary bridge'': Any bridge not included in the main ring or the main bridge. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「bridged compounds」の詳細全文を読む スポンサード リンク
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