Organomagnesium halides,
RMgX, having a carbon–magnesium bond (or their equilibrium mixtures in solution with
R2Mg +
MgX2).
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1338 (https://doi.org/10.1351/pac199567081307)