An Mg4 tetrahedron constitutes the center of the chelate complex anion of 1, which is obtained in 85% yield from diethyl malonate, methylmagnesium iodide, and oxalyl chloride (1:1:0.25). Acid hydrolysis of 1 affords the free chelate ligand, which is an extremely interesting synthetic building block.
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Saalfrank et al. (1988) studied this question.
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