Methylene bridge

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What Wikipedia says

In chemistry, a methylene bridge is part of a molecule with formula −CH2−. The carbon atom is connected by single bonds to two other distinct atoms in the rest of the molecule. A methylene bridge is often called a methylene group or simply methylene, as in "methylene chloride" (dichloromethane CH2Cl2).

Excerpt from the Wikipedia article “Methylene bridge”, under the CC BY-SA 4.0 license. Read the article on Wikipedia