In general, a continuously operated flow reactor yields higher selectivity and consequently product quality for Grignard reagent syntheses than a synthesis in a semi-continuous batch process due to the reduced degree of backmixing. The comparatively low reaction volume of flow reactors provides a more precise temperature control and comes along with a reduced hazard potential that would stem from the release of toxic and hazardous chemicals in the event of leakage. The resulting smaller reactor dimensions, even on a large industrial scale, and the possibility of modularization of the production plant allow flexibility of the production process in terms of adaptation to different environments and available space. To sum up, the continuous synthesis of a Grignard reagent has the potential to improve product quality, increase process safety and enable process flexibility.