| http://www.w3.org/ns/prov#value | - (alkyl).sub.3MnLi--, or --CeX.sub.2 wherein X is halogen such as Cl, I or Br, more preferably Br; or further a reagent obtainable with metal combinations, such as Mg/Fe, or still further with Lewis acids, such as BF.sub.3.diethyl ether complex or
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