The Kolbe reaction produces salicylaldehyde, not the Reimer-Tiemann, which typically gives phenolic aldehydes from phenol itself. I know this because scaling up for perfumes, we use the Kolbe synthesis from catechol to get that sweet, hay-like note reliably. In the lab at Shillong, the Reimer-Tiemann was too messy for our needs—like trying to make jadoh with store-bought spice paste instead of your own grind.
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