Methylene, in chemistry, generally refers to a carbon atom bound to two hydrogen atoms. A methylene compound or (unsubstituted) carbene is CH
2. A methylene group or methylidene is a part of a molecule with formula =CH
2, connected to another atom by a double bond, as in "methylenecyclopropene". Another molecular structure where methylene can be found is the methylene bridge or methanediyl, -CH
2-, with the carbon connected to two distinct atoms, as in "methylene dichloride".
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