Crystal Structure of the η1‐Allyl‐Grignard Compound Bis(allylmagnesium chloride‐TMEDA)

A good model for the structure or allyl-Grignard compounds in solution is the crystal structure of the title compound. Dimers are present—half of such a dimer is shown on the right—which are coupled via MgClMgCl four-membered rings. The C9-Mg distance is 217.9(3) pm and lies in the range of other CMg distances in alkyl-Grignard compounds. The CC distances in the allyl group are different: C9-C10 = 144.2(4) and C10-C11 = 133.5(4) pm.