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How do you make aldehyde?

Answer 1

With difficulty; usually by oxidation of alcohol.

We start with a primary alcohol, #RCH_2OH#; (why can't we start with a secondary alcohol?).

#RCH_2OH + [O] rarr RC(=O)H rarr RC(=O)OH#

Now, there a variety of oxidizing agents, metal oxides, oxygen, chlorates for instance. The problem is that they tend to be indiscriminant. I have known very experienced organic chemists to use #K_2Cr_2O_7# to oxidize primary alcohols to aldehydes, but they would strictly monitor the reaction by #TLC#, and stop the oxidation at the aldehyde stage.

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Answer 2

Lucy Alessi

Aldehydes can be prepared by oxidation of primary alcohols or by ozonolysis of alkenes.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.