A series of four, five and six-coordinated magnesium derivatives integrating with substituted pyrrole and ketimine ligands are conveniently synthesized. Reaction of two equiv of 2-dimethylaminomethyl pyrrole with Mg[N(SiMe 3 ) 2 ] 2 in THF affords the monomeric magnesium complex Mg[C 4 H 3 N(2-CH 2 NMe 2 )] 2 (THF) 2 (1) in high yield along with elimination of two equiv of HN(SiMe 3 ) 2 . Similarly, the reaction between two equiv of 2-t-butylaminomethyl pyrrole and Mg[N(SiMe 3 ) 2 ] 2 in THF renders the magnesium derivative, Mg[C 4 H 3 N(2-CH 2 NH t Bu)] 2 (THF) 2 (2) in good yield. Interestingly, reaction between two equiv of 2-t-butylaminomethyl pyrrole and Mg[N(SiMe 3 ) 2 ] 2 in toluene, instead of THF, generates Mg[C 4 H 3 N(2-CH 2 NH t Bu)] 2 (3), also in high yield. Furthermore, the assembly of two equiv of ketimine ligand, HOCMeCHCMeNAr (Ar = C 6 H 3 -2,6-i Pr 2 ) and Mg[N(SiMe 3 ) 2 ] 2 , yields five-coordinated magnesium derivatives, Mg(OCMeCHCMeNAr) 2 (THF) (4) and Mg(OCMeCHCMeNAr) 2 (OEt 2 ) (5), using THF and diethyl ether, respectively. All the aforementioned derivatives are characterized by 1 H and 13 C NMR spectroscopy as well as 1, 3, 4 and 5 are subjected to X-ray diffraction analysis in solid state.
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