Alkylidene group

In organic chemistry, alkylidene is a general term for divalent functional groups of the form R2C=, where each R is an alkane or hydrogen. They can be considered the functional group corresponding to mono- or disubstituted divalent carbenes (known as alkylidenes), or as the result of removing two hydrogen atoms from the same carbon atom in an alkane.

The simplest alkylidene group is the methylidene group, H2C=. This is also known by the common name methylene, which can also refer to the methylene bridge group −CH2− or the diradical carbene :CH2.

In organometallic chemistry, divalent ligands are referred to as carbenes, with the term "alkylidene" referring specifically to the narrower class of Schrock carbenes.

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