3,3-Di(hydrocarbyl) or 3-hydrocarbylidene-2-benzofuran-1(3H)-ones.
See:
phthaleins
Source: PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1359 [Terms] [Paper]