How are simple and mixed ethers prepared using diazomethane.

Explanation

dimethyl ether is the only simple ether which can be prepared by the action of diazomethane on methanol in presence of tetrafluoroboric acid (`HBF_(4))`

Reaction of alcohols, other than methanol, with `CH_(2)N_(2)` in presence `HBF_(4)` gives mixed ethers.
`underset("Ethanol")(CH_(3)CH_(2)OH)+:overset(-)(C)H_(2)-overset(+)(N)-=N overset(HBF_(3)) underset("Ethyl methyl ether")(CH_(3)CH_(2)-O-CH_(3))+N_(2)`