Both are electrophilic substitution reactions in phenol, but Reimer-Tiemann uses chloroform and a base to give salicylaldehyde, while Kolbe's uses carbon dioxide to give salicylic acid. So yes, Reimer-Tiemann gives salicylaldehyde.
I remember this because Papa tested me last night under our ceiling fan, its *ta-thap ta-thap* sound keeping time. He said, "Beta, Reimer-Tiemann is like the canal road—straight to the point. Kolbe is the longer route." Now I can't forget it, even with the fees receipt lying right there on his ledger.
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