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Benzyl Alcohol and Benzoic Acid from Benzaldehyde and Strong Potash (Cannizzaro, Gattermann 1914)
Charlie

Nilikha ni

Charlie

4. Nobyembre 2026DE
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Benzyl Alcohol and Benzoic Acid from Benzaldehyde and Strong Potash (Cannizzaro, Gattermann 1914)

Strong potash splits benzaldehyde in two: half is reduced to benzyl alcohol, half oxidised to benzoic acid (as potassium benzoate). 20 g of benzaldehyde gives about 8 g of benzyl alcohol, boiling at 206 °C; the benzoic acid is thrown down with hydrochloric acid. Not given: the volumes of water and ether, the amount of hydrochloric acid and the benzoic acid yield. Source: L. Gattermann, Practical Methods of Organic Chemistry (1914 ed.), Reaction 25, pp. 303-304. Picture: our drawing.
Katamtaman
1 night plus a few hours

Mga Tagubilin

1

Shake with strong potash

Dissolve 18 g of potassium hydroxide in 12 g of water and let it cool. Put 20 g of benzaldehyde in a stoppered cylinder or other thick-walled vessel, add the cold potash and shake until a lasting emulsion forms.

Mga materyales para sa hakbang na ito:

BenzaldehydeBenzaldehyde1 20 g
Potassium hydroxidePotassium hydroxide1 18 g
TubigTubig1 12 g

Mga kailangang kasangkapan:

TimbanganTimbangan
Silindrong panukatSilindrong panukat
Mga tapon na kortsaMga tapon na kortsa
2

Stand overnight

Close the vessel with a cork, not a glass stopper (a glass stopper can stick fast), and let it stand overnight. A crystalline paste of potassium benzoate separates.

Mga kailangang kasangkapan:

Silindrong panukatSilindrong panukat
Mga tapon na kortsaMga tapon na kortsa
3

Extract with ether

Add water until the paste dissolves to a clear solution. Shake it out several times with ether to take up the benzyl alcohol, keeping the watery alkaline layer for the benzoic acid.

Mga materyales para sa hakbang na ito:

TubigTubig1 amount not given
Diethyl etherDiethyl ether1 amount not given

Mga kailangang kasangkapan:

Embudong panghiwalayEmbudong panghiwalay
Basong Salamin na Pang-aghamBasong Salamin na Pang-agham
4

Distil the benzyl alcohol

Evaporate the ether and distil the residue. Benzyl alcohol passes over at 206 °C. Yield: about 8 g.

Mga kailangang kasangkapan:

Water BathWater Bath
Prasko ng Salamin sa DistilasyonPrasko ng Salamin sa Distilasyon
Kondenser na pinalalamig ng tubigKondenser na pinalalamig ng tubig
TermometroTermometro
Bunsen burnerBunsen burner
5

Precipitate the benzoic acid

Acidify the alkaline solution with hydrochloric acid; benzoic acid is thrown down. Filter it off.

Mga materyales para sa hakbang na ito:

Hydrochloric acidHydrochloric acid1 amount not given

Mga kailangang kasangkapan:

Basong Salamin na Pang-aghamBasong Salamin na Pang-agham
Embudong Salamin na May TangkayEmbudong Salamin na May Tangkay
Papel na PansalaPapel na Pansala

Mga Materyales

5
  • 1
    Benzaldehyde
    1 20 g
    Placeholder
  • 1
    Potassium hydroxide
    1 18 g
    Placeholder
  • 13
    Tubig
    1 amount not given
    Placeholder
  • 3
    Diethyl ether
    1 amount not given
    Placeholder
  • 5
    Hydrochloric acid
    1 amount not given
    Placeholder

Mga Kinakailangang Kasangkapan

12

Ang blueprint na ito ay gumagawa ng

Thumbnail
Placeholder

Benzoic acid

Free

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Thumbnail
Placeholder

Benzyl Alcohol

Free

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CC0 Pampublikong Domain

Ang blueprint na ito ay inilabas sa ilalim ng CC0. Malaya kang kumopya, magbago, mamahagi, at gumamit nang walang pahintulot.

Suportahan ang Maker sa pamamagitan ng pagbili ng mga produkto sa kanilang Blueprint Komisyon ng Maker itinakda ng mga Vendor, o lumikha ng bagong bersyon ng Blueprint na ito at isama bilang koneksyon sa iyong Blueprint upang ibahagi ang kita.

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