-1
$\begingroup$

My text book says that alcohol in presence of $\ce{CrO3}$ will only give aldehyde. But I then saw this question in which $\ce{CrO3}$ oxidizes alcohol directly to carboxylic acid.

I need to know in which conditions it will give aldehyde and in which conditions it will give carboxylic acid.

$\endgroup$
1
1
$\begingroup$

Generally you need anhydrous conditions to get the aldehyde because aldehydes that can form hydrates are further oxidised to the acid. Anhydrous conditions with a complexing agent such as pyridine to aid solubility (e.g. Collins reagent 1) will give good yields of aldehydes.

Aq. acid conditions (known as Jones reagent) 2 give the carboxylic acid

See this answer How does PCC not oxidize aldehyde?

The use of Chromium reagents has greatly diminished due to their toxicity and waste disposal problems.

$\endgroup$

Not the answer you're looking for? Browse other questions tagged or ask your own question.