Synthesis of Benzoin

To a RBF add 2 g of sodium cyanide and 6 mL of water, 20 g of benzaldehyde and 20 mL of ethanol. Reflux gently for 2 h, then remove the condenser and heat until some solid starts to form, then let it stand for 1 h. Filter wash the filtrate with 2x 10 mL of cold water and 30 mL of cold ethanol. The product is quite pure but should be recrystallized from ethanol.

Source

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The reagents were combined

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After the reflux, the solution turned more yellow

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On cooling the benzoin starts to crystallize

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The benzoin crystallized out

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Filtering and washing

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The almost pure benzoin

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