Hydrochloric Acid → 3-Chloro-4-cyclohexylcinnamic acid

HRID 426806Notes

Reaction equation

HRID 426806 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]([CH:7]=[CH:8][C:9]=1[CH:10]1[CH2:15][CH2:14][CH2:13][CH2:12][CH2:11]1)[CH:5]=O.C(O)(=O)[CH2:17][C:18]([OH:20])=[O:19].N1CCCCC1.Cl>N1C=CC=CC=1>[Cl:1][C:2]1[CH:3]=[C:4]([CH:7]=[CH:8][C:9]=1[CH:10]1[CH2:15][CH2:14][CH2:13][CH2:12][CH2:11]1)[CH:5]=[CH:17][C:18]([OH:20])=[O:19]

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 867Malonic Acid2×HCID 8082PiperidineHCID 107277773-Chloro-4-cyclohexylbenzaldehyde

Product 1

HCID 542933553-Chloro-4-cyclohexylcinnamic acid

Reagents, catalysts & solvents 1

HCID 1049PyridineSolvent

Procedure

3-Chloro-4-cyclohexylbenzaldehyde (0.1 mole), malonic acid (0.2 moles), and dry pyridine (175 ml) are placed in a 1 l round-bottom flask. The malonic acid is dissolved by shaking on a steam bath and piperidine (0.5 ml) is added. The reaction is allowed to take place on the steam bath for 4 hours. After standing at room temperature ovenight, the mixture is refluxed for 1 hour and cooled. The reaction mixture is poured into 250 ml of ice water and acidified with concentrated hydrochloric acid (80 ml) with stirring. The crystals of product are collected by filtration, washed with water (4×150 ml) and air dreid. Recrystallization from acetone-water gives 3-chloro-4-cyclohexylcinnamic acid.

Workup

  1. customfor 4 hours
  2. customAfter standing at room temperature
  3. temperaturethe mixture is refluxed for 1 hour
  4. temperaturecooled
  5. stirringwith stirring
  6. filtrationThe crystals of product are collected by filtration
  7. washwashed with water (4×150 ml) and air dreid
  8. customRecrystallization from acetone-water

Sources & evidence

ORD record
ord-07eb48e999194cda82fcf1fbd765fef1
Source dataset
uspto-grants-1979_10
Patent number
US04171373

Reaction notes

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