What you are talking about is a Grignard reaction. This is a chemical reaction where an alkylmagnesium halide is reacted with an electrophile like a carbonyl group. The alkylmagnesium halide reagent is often called the Grignard reagent. It is an organometallic species that is composed of a hydrocarbon (alkyl group) and a charged magnesium species. Ethylmagnesium bromide (EtMgBr) is a common example. The magnesium bromide is basically a cation and the ethyl group is basically a carbanion which can act as a nucleophile in a chemical reaction. Mg/ether is a common way in organic chemistry to denote solid magnesium metal in ether. This is a classic way to prepare a Grignard reagent. An alkyl halide like ethyl bromide (EtBr) is dissolved in diethyl ether as a solvent. Solid magnesium is added to convert the ethyl bromide to ethylmagnesium bromide. In writing a chemical reaction, the phrase "Mg/ether" is often written above the reaction arrow to denote this reaction.
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