Allylic Rearrangements. XVI. The Addition of the Butenyl Grignard Reagent to Some Simple Carbonyl Compounds

The nature of allylic Grignard reagents has been the subject of many investigations. Aside from those cases where the allylic double bond is included in an aromatic ring (as benzylmagnesium chloride) the structures of these substances are still open to question. For a simple primary-secondary allylic system it may be expected that the Grignard reagent will be primary (I), secondary (II) or a mixture of these forms.