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Reference.org
Salicylaldehyde
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<p>Salicylic aldehyde (2-hydroxybenzaldehyde) is an <a href="/facts/Organic_compound/gqCNaN45">organic compound</a> with the formula C6H4OH(CHO). Along with <a href="/facts/3-hydroxybenzaldehyde/ex17t4fr">3-hydroxybenzaldehyde</a> and <a href="/facts/4-hydroxybenzaldehyde/P1de9zxk">4-hydroxybenzaldehyde</a>, it is one of the three <a href="/facts/Isomer/PXlvDVdg">isomers</a> of <a href="/facts/Phenolic_aldehyde/KjzoR3dj">hydroxybenzaldehyde</a>. This colorless oily liquid has a bitter almond odor at higher concentration. Salicylaldehyde is a precursor to coumarin and a variety of <a href="/facts/Chelating_agent/4G79sXBB">chelating agents</a>. </p>