1971 Nomencl. Org. Chem. (I.U.P.A.C.) (ed. 3) A. 17Names of bivalent radicals derived from saturated or unsaturated monocyclic hydrocarbons by removal of two atoms of hydrogen from the same carbon atom of the ring are obtained by replacing the endings ‘-ane’, ‘-ene’, ‘-yne’, by ‘-ylidene’, ‘-enylidene’ and ‘-ynylidene’, respectively.
-yl·i·dene
\ˈiləˌdēn, _ə̇l-\ noun suffix
(-s)
Etymology: International Scientific Vocabulary -yl + -idene
: bivalent radical derived especially from a saturated hydrocarbon by removal of two hydrogen atoms from the same carbon atom or by removal of the oxygen atom of an aldehyde
< citrylidene >
— in the system adopted by the International Union of Pure and Applied Chemistry — compare -idene
< citrylidene >
— in the system adopted by the International Union of Pure and Applied Chemistry — compare -idene
-ylidene
Suffix
- organic chemistry Forms the names of divalent radicals or groups connected through a carbon double bond