how will you convert 2-chlorobutane to 2-methyl butanoic
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make a grignard compound.
2-chlorobutane -----> Cl-Mg-butane using Mg metal in ether.
The magnesium metal inserts itself between the chlorine atom and carbon 2 atom of butane.
Now, carboxylation of a grignard gives you a carboxylic acid:
Cl-Mg-butane --------> 2-methylbutanoic acid using 1. CO2, ether and then 2. H3O+.
CO2 takes the place of the MgCl at the 2 position of butane, and once you add a proton source (H3O+) it becomes a carboxylic acid.
The carbon of the newly added COOH becomes part of the backbone of the molecule and using the proper nomenclature rules, now you have 2-methylbutanoic acid.
Thats 2 reactions (steps) total.
1. Formation of grignard with Mg in ether
2. Carboxylation of a grignard with CO2 in ether followed by acidic workup.
2-chlorobutane -----> Cl-Mg-butane using Mg metal in ether.
The magnesium metal inserts itself between the chlorine atom and carbon 2 atom of butane.
Now, carboxylation of a grignard gives you a carboxylic acid:
Cl-Mg-butane --------> 2-methylbutanoic acid using 1. CO2, ether and then 2. H3O+.
CO2 takes the place of the MgCl at the 2 position of butane, and once you add a proton source (H3O+) it becomes a carboxylic acid.
The carbon of the newly added COOH becomes part of the backbone of the molecule and using the proper nomenclature rules, now you have 2-methylbutanoic acid.
Thats 2 reactions (steps) total.
1. Formation of grignard with Mg in ether
2. Carboxylation of a grignard with CO2 in ether followed by acidic workup.
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