Alk-1-yn-1-ols,
RC≡COH; tautomeric with ketenes
RCH=C=O.
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1375 (https://doi.org/10.1351/pac199567081307)