An organic compound or functional group containing a carbon atom bonded to two other carbon atoms with a double bond (=CH-).
From 'alkyl' (hydrocarbon group) + '-idene' (suffix for divalent radicals). This is modern chemical nomenclature describing reactive molecular fragments.
Alkylidene groups are like molecular 'sticky fingers'—they have two bonds ready to grab other atoms, making them crucial intermediate compounds in pharmaceutical synthesis.
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