Ah, Reimer-Tiemann uses chloroform and base on phenol to make -CHO, while Kolbe turns phenol into salicylic acid with CO₂. For salicylaldehyde, you want Reimer-Tiemann.
But in my costing sheets, Reimer-Tiemann is a stubborn child—chloroform price jumps more than onions in monsoon, and the yield breaks your heart. That old Kolbe, with its CO₂, is steadier, like my ceiling fan.
So which one gives salicylaldehyde? The books say Reimer-Tiemann. But my life says if the raw material cost in rupees is singing a sad song, sometimes the 'right' reaction is the wrong choice for the factory floor.
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