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- noun organic chemistry Any
organic compoundin which two adjacent atomsare connected by both a covalentand an ionic bond; normally written X+-Y-
from Wiktionary, Creative Commons Attribution/Share-Alike License
From the resonance structure between the covalent form (-yl, where the carbanion exists as a methylidenyl group) and the ionic form (-ide, as in methanide).
Development of ylide chemistry and, together with that, study of the Stevens and