Directed metalation using TMPMgCl⋅LiCl (TMP=2,2,6,6-tetramethylpiperidide) and subsequent transmetalation with Zn(OPiv)2 leads to aryl and heteroaryl zinc pivalates. After solvent evaporation, easy-to-handle fine powders are obtained that retain most of their activity (>85 %) when exposed to air for 4 h. They smoothly undergo Negishi cross-couplings, and technical-grade solvents can be used without significant loss of yield.
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Stathakis et al. (2012) studied this question.
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