▪ 30 min post-stirring time after complete addition of the halide solution (corresponds to approx. 3 times the residence time in the continuous flow reactor) ▪ synthesis of benzylmagnesium bromide from (bromomethyl)benzene and magnesium turnings In the continuous synthesis process, starting the synthesis at 50°C and using an initially higher flow rate serves solely to accelerate the start of the synthesis and to reach steady state faster, and has no effect on the yields and selectivities achieved. Since no steady state is reached in a discontinuous or semicontinuous operation mode, there is no need to accelerate the start-up behaviour in a batch experiment. Therefore, and for safety reasons, the application of elevated temperatures and feed rates is not used in the batch experiments.