oxonium ylides

https://doi.org/10.1351/goldbook.O04379
  1. Compounds having the structure R2O+–C−R2.
    See: ylides
  2. A class of 1,3-dipolar compounds of general structure R2C=O+–Y−, comprising carbonyl imides, carbonyl oxides and carbonyl ylides.
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1355 (https://doi.org/10.1351/pac199567081307)