Of coordinated alkyl

Although C—H bonds are relatively inactive, hydrogen atoms of coordinated alkyl species do interact with the metal center [66]. This three-way C—H—M bond is called an agostic interaction (from the Greek ayooro, to hold on to oneself) [67]. Agostic interactions are known for many complexes (Figure 3.24) [68,69], and feature in several important elementary steps, such as reductive elimination. They are more common with d° metal centers [70]. 

Fig. 10.16. Proposed geometry of dimers of MeMgBr and LiMgBr in n-BioO at RT and -85 C. On > two of the four possible oxygen coordination siiov are actually occupied hv oxygen atoms of //-BmO solvent molecules, For carbon atoms of coordinated alkyl groups, angles cannot be calculated Irom the liXAFS spectroscopically determined structural parameters 1108].

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