arsine oxides

H3As=O and its hydrocarbyl derivatives. (analogously arsine imides and arsine sulfides), e.g. (CH3)3As=O trimethylarsine oxide or trimethylarsane oxide.
See: imides (2).
Source:
PAC, 1995, 67, 1307 (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1319