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What would be the product of 1-bromopropane with Mg in diethyl ether??
##CH_3CH_2CH_2MgBr##.
The product is called Grignard reagent and the formula is ##CH_3CH_2CH_2MgBr##.
Grignard reagents are very useful precursors in synthetic organic chemistry, since they are easy to prepare and they react relatively fast.
One thing to keep in mind is that once a Grignard reagent is prepared, it should be kept way of moisture. Therefor, the diethyl ether should be anhydrous.