The preparation of a Grignard reagent. The organic halide is added to a magnesium suspension in an ether solvent. The flask is fitted with a reflux condenser, and the mixture is warmed over a water bath for 20 - 30 minutes. 1. It can be noted that many of these reagents can also be purchased commercially. This is done with the help of solvents comprising of ethers (which are described by the formula R-O-R’) because the ligands provided by these solvents help in the stabilization of the organomagnesium compound. The reaction between a Grignard reagent and an ester proceeds in a manner similar to the Grignard reactions of aldehydes or ketones. A typical Grignard reagent might be CH 3 CH 2 MgBr. Grignard reagents are made by adding the halogenoalkane to small bits of magnesium in a flask containing ethoxyethane (commonly called diethyl ether or just "ether"). These reagents are prepared via the treatment of magnesium with organic halides such as alkyl or aryl halides. 2. The carbon-oxygen double bond is broken and a new carbon-carbon bond is … Preparation Of Aldehydes & Ketones From Grignard Reagent - … 3. Preparation of Grignard Reagents. The process of preparing Grignard reagents is described in the points provided below. Magnesium can be reacted with alkyl halides or aryl halides to form Grignard reagents.