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In organic chemistry, alkylidene is a general term for divalent functional groups of the form R2C=, where each R is an alkane or hydrogen.[1] They can be considered the functional group corresponding to mono- or disubstituted divalent carbenes (known as alkylidenes),[2] or as the result of removing two hydrogen atoms from the same carbon atom in an alkane.[3]
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.
- ^ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "alkylidene groups". doi:10.1351/goldbook.A00232
- ^ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "alkylidenes". doi:10.1351/goldbook.A00233
- ^ Moss, G. P.; Smith, P. A. S.; Tavernier, D. (1995). "Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)". Pure and Applied Chemistry. 67 (8–9): 8. doi:10.1351/pac199567081307.