# Oxidation of an alcohol

There exist two oxidations of an alcohol .

• Is oxidation is known as complete.
• Is it is spared.

## Oxidation supplements of an alcohol

To oxidize an alcohol completely, one burns it using a flame. At the end of the reaction, all alcohol reacted and the formed products are carbon dioxide (CO2) and the steam (H2O).

During an oxidation the carbonaceous chain of alcohol supplements is modified.

Here the equation of the general reaction and an example:

$\ rm \left\{C_nH_ \left\{2n+1\right\} OH + \ frac \left\{3n+1\right\} \left\{2\right\} O_2 \ xrightarrow \left\{flame\right\} nCO_2 + \left(n+1\right) H_2O\right\}$

$\ rm \left\{C_4H_9OH + \ frac \left\{13\right\} \left\{2\right\} O_2 \ xrightarrow \left\{flame\right\} 4CO_2 + 5:00 _2O\right\}$

## Controlled oxydation of an alcohol

By controlled oxydation, one can obtain from an alcohol:

To carry out a controlled oxydation, it is necessary to make react alcohol with a Oxydant like the ion MnO4- permanganate or PCC. It occurs then a reaction of Oxydo-réduction.

During a controlled oxydation only the group characteristic hydroxyl of alcohol is concerned.

### Controlled oxydation of a primary education alcohol

example of the propan-1-ol

Half-equations of oxydoreduction: it must there as many have electrons for oxidant than for the reducer (from where the multiplications)

• ×2 {MnO4- + 5e- + 8:00 + = Mn2+ + 4:00 2O}

• ×5 {CH3-CH2-CH2-OH = CH3-CH2-CHO + 2e- + 2:00 +}

equation of the reaction: one combines the two half-equations by removing the electrons

acid 5CH 3-CH2-CH2-OH + 2MnO4- + 6:00 + $\ xrightarrow \left\{\right\}$ 5CH 3-CH2-CHO + 2Mn2+ + 8:00 2O

The acid medium allows the reaction. Generally, one uses SO42- to acidify the solution.
Moreover, when the oxidant is in excess, there is formation of a Carboxylic acid

### Controlled oxydation of a secondary alcohol

example of the propan-2-ol

Half-equations of oxydoreduction: it must there as many have electrons for oxidant than for the reducer (from where the multiplications)

• ×2 {MnO4- + 5e- + 8:00 + = Mn2+ + 4:00 2O}

• ×5 {CH3-CHOH-CH3 = CH3-CO-CH3 + 2e- + 2:00 +}

equation of the reaction: one combines the two half-equations by removing the electrons

acid 5CH 3-CHOH-CH3 + 2MnO4- + 6:00 + $\ xrightarrow \left\{\right\}$ 5CH 3-CO-CH3 + 2Mn2+ + 8:00 2O

The acid medium allows the reaction. Generally, one uses an aqueous solution of sulphuric acid to acidify the medium réactionnel.

## See too

 Random links: Vivendi Ranges | Avlonari | El Rainmaker (pelÃ­cula 1997) | Pont- of-Roide | Sinai mount | UTC-5 | Forme_de_Backus-Naur