Inorganic chemistry, analicyclic compound contains one or more all-carbonrings which may be eithersaturated or unsaturated, but do not havearomatic character.[1] Alicyclic compounds may have one or morealiphaticside chains attached.
The simplest alicyclic compounds are the monocycliccycloalkanes:cyclopropane,cyclobutane,cyclopentane,cyclohexane,cycloheptane,cyclooctane, and so on.Bicyclic alkanes includedecalin,housane, andnorbornane.Polycyclic alkanes includecubane,basketane, andtetrahedrane.
Spiro compounds have two or more rings that are connected through only one carbon atom.
The mode of ring-closing in the formation of many alicyclic compounds can be predicted byBaldwin's rules.
Otto Wallach, a German chemist, received the 1910Nobel Prize in Chemistry for his work on alicyclic compounds.[2][3]
Monocycliccycloalkenes arecyclopropene,cyclobutene,cyclopentene,cyclohexene,cycloheptene,cyclooctene, and so on. Bicyclic alkenes includenorbornene andnorbornadiene.
Two more examples are shown below,methylenecyclohexane on the left and1-methylcyclohexene on the right:
Anexocyclic group is always shown outside the ring structure, take for instance the exocyclic double bond of the former molecule.Isotoluenes are a prominent class of compounds with exocyclic double bonds.
The placement of double bonds in many alicyclic compounds can be predicted withBredt's rule.
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