X-ray structural characterization of some sterically bulky N-donor and N-alkyl Grignard reagents

X-ray crystal structures of [MgBr2(thf)3] and [FisoMg(thf)Cl]2, (Fiso− = [ArNC(H)NAr]−, Ar=C6H3Pr2i-2,6), [2-PyC(SiMe3)2Mg(thf)Cl]2, [2-PyC(SiMe3)2Mg(thf)Br]2, and [(2-PyC(SiMe3)2Mg(thf))2(OEt)Cl] · Et2O, (2-Py(SiMe3)2CH = 2-{bis-(trimethylsilyl)methyl}2-pyridine) are presented.