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How is Grignard reagent prepared? |
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Answer» Solution :Grignard reagent is an aklyl MAGNESIUM halide, `R-MG-X` obtained by the reaction of alkyl halide `R-X` with magnesium `(Mg)` in dry ether. `underset("alkyl halide")(R-X)+Mg overset("dry ether")(to)underset("alkyl")overset(delta-)(R)- underset ("magnesium")overset(2 delta+)(R)-underset ("Iodide")overset(delta-)(X)` When an alkyl halide like `CH_(3)I` is added from a DROPPING funnel to a flask CONTAINING pieces of pure `Mg` in pure and dry ether (diethyl ether) and a trace of iodine, Grignard reagent, `CH_(3)-Mg-I` is formed. `underset("methyl iodide")(CH_(3)-I)+Mg overset("dry ether")(to) underset ("methyl")overset(delta-)(CH_(3))-underset("magnesium")overset(2delta+)(Mg)-underset ("iodide")(delta-)(I)` OR `(overset(delta-)(CH_(3))-overset(2delta+)(Mg)-overset(delta-)(I))` ETHYL iodide when treated with magnesium in presence of dry ether forms ethyl magnesium iodide. `C_(2)H_(5)I+Mgoverset("dry ether")(to) underset("ethyl magnesium iodide")(C_(2)H_(5)-Mg-I)` OR `overset(delta-)((C_(2)H_(5)))-overset(2delta+)(Mg)-overset(delta-)(I)` |
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