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The Hauser base reagents Pr i2 NMgCl 1 and Pr i2 NMgBr 2 react with a variety of enolisable ketones to yield magnesium enolates. Attempts at isolation of these enolates when THF was present in the solvent media was unsuccessful, with the exclusive precipitation of the solvated dihalide salts (MgX 2 .S x , where X=Cl or Br and S=THF, TMEDA or HMPA). Using diethyl...
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