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In organic chemistry, a methylene bridge or methanediyl group is any part of a molecule with formula -CH
2-; namely, a carbon atom bound to two hydrogen atoms and connected by single bonds to two other distinct atoms in the rest of the molecule. It is the repeating unit in the backbone of the unbranched alkanes.
A methylene bridge is often called methylene group or just methylene; as in "methylene chloride" (dichloromethane CH
2). However, the term methylene group (or "methylidene") properly applies to the CH
2 group when it is connected to the rest of the molecule by a double bond, that gives it chemical properties very distinct from those of a bridging CH
- W. A. Herrmann (1982), "The methylene bridge". In Advances in Organometallic Chemistry, volume 20, pages 195-197.
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