Lewis Base Assisted Magnesium Complexes Incorporating Pyrrolyl and Ketiminate Ligands: Synthesis,Structural Diversity and Characterization |
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| Authors: | Li‐Feng Hsueh Min‐Hui Hsieh Shu‐Ya Hsu Cheng‐Yuan Lee Hsiang‐Hua Hsieh Amitabha Datta Jui‐Hsien Huang Chia‐Her Lin Ting‐Yu Lee |
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| Institution: | 1. Department of Chemistry, National Changhua University of Education, Changhua 50058, Taiwan;2. Department of Chemistry, Chung‐Yuan Christian University, Chung‐Li 320, Taiwan;3. Department of Applied Chemistry, National University of Kaohsiung 811, Taiwan |
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| Abstract: | 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 MgN(SiMe3)2]2 in THF affords the monomeric magnesium complex MgC4H3N(2‐CH2NMe2)]2 (THF)2 ( 1 ) in high yield along with elimination of two equiv of HN(SiMe3)2. Similarly, the reaction between two equiv of 2‐t‐butylaminomethyl pyrrole and MgN(SiMe3)2]2 in THF renders the magnesium derivative, MgC4H3N(2‐CH2NHtBu)]2(THF)22( 2 ) in good yield. Interestingly, reaction between two equiv of 2‐t‐butylaminomethyl pyrrole and MgN(SiMe3)2]2 in toluene, instead of THF, generates MgC4H3N(2‐CH2NHtBu)]2 ( 3 ), also in high yield. Furthermore, the assembly of two equiv of ketimine ligand, HOCMeCHCMeNAr (Ar = C6H3‐2,6‐iPr2) and MgN(SiMe3)2]2, yields five‐coordinated magnesium derivatives, Mg(OCMeCHCMeNAr)2(THF) ( 4 ) and Mg(OCMeCHCMeNAr)2(OEt2) ( 5 ), using THF and diethyl ether, respectively. All the aforementioned derivatives are characterized by 1H and 13C NMR spectroscopy as well as 1 , 3 , 4 and 5 are subjected to X‐ray diffraction analysis in solid state. |
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| Keywords: | Magnesium Pyrrolyl Ketiminate Lewis base |
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