Overall Reaction :

Ether and epoxides

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» Ether and epoxides

» Structure and bondangle ..

» Preparation

» Alcohol with diazometha ..

» Overall Reaction :

» Reaction with Lewis Acid ..

» Ring?cleavage reactions ..

» Deoxygenation of oxiran ..

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Overall Reaction :

Overall Reaction :

Mechanism of reaction

Step A :
Ether reacts with proton to give a dialkyloxonium ion (oxonium salt)

Step B :
Halide attack on carbon of the dialkyloxonium ion. This step gives each molecule of an alkyl halide and an alcohol.

Step C :
In last step where an alcohol is converted to an alkyl halide.

(iii) Reaction with HI (fission reaction)
Reaction with HI is an example of fission reaction where cleavage is decided by structure of ether. If there is smaller alkyl group up to secondary than fission is S
_N
2 so back attack of nucleophile occurs while for large alkyl group always fission by S
_N
1 mechanism because they prefer carbocation mechanism.

When ethers reacts with cold HI to form one mole of alkyl iodide. This when reacts with silver nitrate to form yellow precipitate of AgI.

By finding out the weight of AgI we can find out the structure of ether. This method is known as of
zeisal’s method
for estimation of alkoxy group in the molecule for example.

Problem
0.74 gm of methyl ether forms 2.35 gm of AgI at NTP find out sturcture of methyl ether ?

(iv) Reaction with dil H₂SO₄

(v) Reaction with CO

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