A class of 1,3-@D01753@ of general structure R2C=O+–Y−, comprising @C00845@, @C00847@ and @C00848@.
Source: PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1355 [Terms] [Paper]