1,3-Diphenylpropenone (benzylideneacetophenone),
ArCH=CH(=O)Ar
, and its derivatives formed by substitution.
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1327 (https://doi.org/10.1351/pac199567081307)