ABSTRACT
It has been made clear, in Chapter 1 1 , that the nature of the Grignard reagent has a great influence on the mechanism of its reactions. The extremes in the reactivity spectrum of organomagnesium compounds in their interaction with ketones, for example, are ( 1 ) reactions in which a single electron transfer occurs a s the first step, o r (2) reactions in which a concerted bond-breaking-bond-making takes place within a cyclic transition state.
