Reaktion #75351

Reaktionsgleichung

sodium

3,4-dihydro-2H-pyran-2-carboxylic acid

hydrogen

→

Tetrahydropyran-2-carboxylic acid

Lösungsmittel

methanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   Filtrationwas filtered
2. 2
   Sonstigethe solvents removed in vacuo
3. 3
   Extraktionextracted with chloroform
4. 4
   workup.DISTILLATIONDistillation
5. 5
   Sonstigegave 143.8 g

Vorschrift

210 g. of the sodium salt of 3,4-dihydro-2H-pyran-2-carboxylic acid dissolved in 2 liters methanol and hydrogenated at 3 atmosphere pressure over 60 g. haney nickel catalyst. After hydrogen uptake was complete the catalyst was filtered and the solvents removed in vacuo. The residue was acidified with concentrated hydrochloric acid and extracted with chloroform. Distillation gave 143.8 g. product, b.p. 75°-80° C./0.4 mm ND25 =1.4633.

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