Acetone → 1,5-Bis(2-methylphenyl)-1,4-pentadien-3-one

HRID 77664Notes

Reaction equation

HRID 77664 reaction equation
[CH3:1][C:2]1[CH:9]=[CH:8][CH:7]=[CH:6][C:3]=1[CH:4]=O.[CH3:10][C:11]([CH3:13])=[O:12].[OH-].[Na+].O>C(O)C>[CH3:1][C:2]1[CH:9]=[CH:8][CH:7]=[CH:6][C:3]=1[CH:4]=[CH:10][C:11](=[O:12])[CH:13]=[CH:1][C:2]1[CH:9]=[CH:8][CH:7]=[CH:6][C:3]=1[CH3:4]

Participants

6

Reactant 4

HCID 180AcetoneHCID 962WaterHCID 107222-MethylbenzaldehydeHCID 14798Sodium Hydroxide

Product 1

HCID 45639421,5-Bis(2-methylphenyl)-1,4-pentadien-3-oneYield 43.3%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

2-Methylbenzaldehyde (1ac, 1.45 ml, 12.5 mmol) and acetone (19, 0.46 ml, 6.3 mmol) were combined in ethanol (20 ml) and stirred for 15 min at room temperature. A solution of sodium hydroxide (2.61 g, 65.3 mmol) and water (25 ml) was added and the mixture stirred for 3 hr at room temperature. The resulting mixture was extracted into ethyl acetate, washed with saturated sodium chloride, dried over magnesium sulfate, filtered and evaporated to afford a solid. The crude solid was recrystallized from ethanol to give 0.71 g (43%) of a yellow solid: mp 98-100° C. [expected mp 94-96° C.]; 1H NMR: δ 2.47 (s, 6H), 6.98 (d, 2H, J=15.9 Hz), 7.24 (m, 6H), 7.64 (d, 2H, J=7.2 Hz), 8.03 (d, 2H, J=15.9 Hz); 13C NMR: δ 19.7, 126.1, 126.2, 126.5, 129.9, 130.7, 133.6, 137.9, 140.5, 188.5.

Workup

  1. stirringthe mixture stirred for 3 hr at room temperature
  2. extractionThe resulting mixture was extracted into ethyl acetate
  3. washwashed with saturated sodium chloride
  4. dry with materialdried over magnesium sulfate
  5. filtrationfiltered
  6. customevaporated
  7. customto afford a solid
  8. customThe crude solid was recrystallized from ethanol

Sources & evidence

ORD record
ord-fc1f282e551a4b55939d9e559b61ed9f
Source dataset
uspto-grants-2014_09
Patent number
US08841326B2

Reaction notes

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