Synthesis and Structural Studies on [Mg3(O2CC⋮CSiMe3)6(HMPA)4]:  Mechanistic Implications for the Formation of the μ4-η4 Bonding Type in Carbamato-Bridged Mg6 Cage Compounds

The insertion reaction of CO2 with Mg(C⋮CSiMe3)2 was characterized by NMR spectroscopic studies to give a cage compound [Mg n (O2CC⋮CSiMe3)2 n ·(THF) m ], 1a, and the addition of HMPA/THF (HMPA = hexamethylphosphoramide) to solutions of 1a produces a trimeric compound, [Mg3(O2CC⋮CSiMe3)6(HMPA)4], 1b...

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Bibliographic Details
Published in:Organometallics 2002-03, Vol.21 (6), p.1296-1299
Main Authors: Yang, Kuo-Ching, Chang, Chung-Cheng, Yeh, Charng-Sheng, Lee, Gene-Hsiang, Wang, Yu
Format: Article
Language:English
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Summary:The insertion reaction of CO2 with Mg(C⋮CSiMe3)2 was characterized by NMR spectroscopic studies to give a cage compound [Mg n (O2CC⋮CSiMe3)2 n ·(THF) m ], 1a, and the addition of HMPA/THF (HMPA = hexamethylphosphoramide) to solutions of 1a produces a trimeric compound, [Mg3(O2CC⋮CSiMe3)6(HMPA)4], 1b. X-ray diffraction studies of this showed 1b to contain a completely centrosymmetric linear array of magnesium atoms linked with μ2-η2- and μ2-η3-O2CC⋮CSiMe3. It was found to be a key compound in the mechanism leading to the formation of μ4-η4 bonding in carbamato-bridged Mg6 cage compounds.
ISSN:0276-7333
1520-6041
DOI:10.1021/om010615k