R2C+–CR=C−R
.
E.g.
H2C=CHC:H prop-2-en-1-ylidene.
See: 1,3-dipolar compounds
Source:
PAC, 1995, 67, 1307
(Glossary of class names of organic compounds and reactivity intermediates based on
structure (IUPAC Recommendations 1995))
on page 1374