Acetic Acid → 2-(Propan-2-ylidene)cyclopentan-1-one

HRID 1655659Notes

Reaction equation

HRID 1655659 reaction equation
[CH3:1][C:2]([CH3:4])=O.[OH-].[Na+].[C:7]1(=[O:12])[CH2:11][CH2:10][CH2:9][CH2:8]1.C(O)(=O)C>O>[CH3:1][C:2](=[C:8]1[CH2:9][CH2:10][CH2:11][C:7]1=[O:12])[CH3:4]

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 180AcetoneHCID 8452CyclopentanoneHCID 14798Sodium Hydroxide

Product 1

HCID 53240552-(Propan-2-ylidene)cyclopentan-1-one

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

A mixture of 190 ml of acetone and 36.0 g of sodium hydroxide in 600 ml of water was treated with 60.0 g of cyclopentanone under stirring. After stirring for about 12 hours at about room temperature, the mixture was neutralized with 36% acetic acid and extracted with three 60 ml portions of ether. The combined extracts were dried over anhydrous magnesium sulfate and evaporated to give a residue. The residue was distilled to obtain 62.6 g of 2-(1-methylethylidene) cyclopentanone as a colorless liquid. The boiling point of this intermediate compound was determined to be 85°-88° C. at a pressure of 10 mm Hg. A subsequent Mannich reaction yielded the 2-Dimethylaminomethyl-5-(1-methylethylidene) cyclopentanone hydrochloride. The melting point of the product was determined to be 173°-175° C.

Workup

  1. stirringAfter stirring for about 12 hours at about room temperature
  2. extractionextracted with three 60 ml portions of ether
  3. dry with materialThe combined extracts were dried over anhydrous magnesium sulfate
  4. customevaporated
  5. customto give a residue
  6. distillationThe residue was distilled

Sources & evidence

ORD record
ord-f2a26aa9468a4e9d89361b536edbc4e4
Source dataset
uspto-grants-1993_10
Patent number
US05250735

Reaction notes

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