acetals derived from ketones by replacement of the oxo group by two hydrocarbyloxy groups R2C(OR)2
). This term, once abandoned, has been reinstated as a subclass of acetals.
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1345 (https://doi.org/10.1351/pac199567081307)