hydrocarbylidene groups

Divalent groups, R2C=, formed by removing two hydrogen atoms from the same carbon atom of a @H02889@, the free valencies of which are engaged in a double bond.
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1341 [Terms] [Paper]