Structurally Characterized 1,1,3,3-Tetramethylguanidine Solvated Magnesium Aryloxide Complexes: [Mg(μ-OEt)(DBP)(H-TMG)]<sub>2</sub>, [Mg(μ-OBc)(DBP)(H-TMG)]<sub>2</sub>, [Mg(μ-TMBA)(DBP)(H-TMG)]<sub>2</sub>, [Mg(μ-DPP)(DBP)(H-TMG)]<sub>2</sub>, [Mg(BMP)<sub>2</sub>(H-TMG)<sub>2</sub>], [Mg(O-2,6-Ph
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The synthesis and structural characterization of several 1,1,3,3-tetramethylguanidine (H-TMG) solvated magnesium aryloxide complexes are reported. Bu2Mg was successfully reacted with H-TMG, HOC6H3(CMe3)2-2,6 (H-DBP), and either ethanol, a carboxylic acid, or diphenyl phosphate in a 1:1 ratio to yield the corresponding [Mg(μ-L)(DBP)(H-TMG)]2 where L = OCH2CH3 (OEt, 1), O2CC(CH3)3 (OBc, 2), O2C(C6H2-2,4,6-(CH3)3) (TMBA, 3), or O2P(OC6H5)2 (DPP, 4). Bu2Mg was also reacted with two equivalents of H-TMG and HOC6H3(CMe3)-2-(CH3)-6 (BMP) or HO-2,6-Ph2C6H3 to yield [Mg(BMP)2(H-TMG)2] (5) and [Mg(O-2,6-Ph2C6H3)2(H-TMG)2] (6). Compounds 1−6 were characterized by single-crystal X-ray diffraction. Polymerization of l- and rac-lactide with 1 was found to generate polylactide (PLA). A discussion concerning the relevance of compounds 2 - 4 to the structure of Mg-activated phosphatase enzymes is also provided. The bulk powders for all complexes were found to be in agreement with the crystal structures based on elemental analyses, FT-IR spectroscopy, and 1H, 13C and 31P NMR studies.
