Mechanically induced reactions of magnesium with halonaphthalenes, under solvent-free conditions, provide the corresponding Grignard reagents in good yields. The use of excess Mg to obtain a solid (powder) product, however, means that quenching reactions using aromatic ketones involve some contribution from McMurry coupling of these species, in addition to alcohol formation by the true quenching process.
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Harrowfield et al. (2001) studied this question.