Note that ylide is a complete word, not to be confused with the suffix -ylide, used for some radical anions. Subclasses of ylides . E.g. nitrogen ylide, phosphorus ylide, oxygen ylide, sulfur ylide. A further specification may be achieved by citing the class name of RmX before the word ylide. Neutral compounds having formal unit electrical charges of opposite sign.
Some chemists restrict the term to compounds with the charges on non-adjacent atoms.
See betaines , dipolar compounds , ylides .