#Isobutyraldehyde Aldol or Cannizzaro?

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shadow burrow
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My teacher told me that isobutyraldehyde can't undergo aldol since its too sterically crowded and is thus an exception, and that it gives Cannizzaro on reaction with a base.
But in a mains '22 question, isobutyraldehyde reacts with formaldehyde to give an aldol product. What's going on here?

steel marlinBOT
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patent horizon
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But it doesn't undergo the following condensation reaction (dehydration) because it doesn't have a beta hydrogen that can be abstracted to form a double bond.

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@shadow burrow

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Ah, on further research, I found that yes, isobutyraldehyde undergoes the Cannizarro rxn, but it's not that it can't undergo aldol formation,just that the rates are different.

shadow burrow
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Makes sense, thanks

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+solved opt314