Benzaldehyde → 2-Benzylidene-1,3-indandione

HRID 1071767Notes

Reaction equation

HRID 1071767 reaction equation
[B]=O.[CH:3](=[O:10])[C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1.[C:11]1(=[O:21])[C:19]2[C:14](=[CH:15][CH:16]=[CH:17][CH:18]=2)[CH2:13][C:12]1=O>N1CCCCC1.C1C=CC=CC=1>[CH:13](=[C:12]1[C:3](=[O:10])[C:4]2[C:9](=[CH:8][CH:7]=[CH:6][CH:5]=2)[C:11]1=[O:21])[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1

Participants

6

Reactant 3

HCID 240BenzaldehydeHCID 1233581,2-IndandioneHCID 6327189Boron monoxide

Product 1

HCID 2378222-Benzylidene-1,3-indandione

Reagents, catalysts & solvents 2

HCID 8082PiperidineCatalystHCID 241BenzeneSolvent

Procedure

(8) (Chem. Pharm. Bull. 1974, 22(2), 448-451). Boron oxide (720 mg, 10.26 mmol) and benzaldehyde (800 mg, 7.53 mmol) were added to a stirred solution of the indandione (1.00 g, 6.84 mmol) and piperidine (3 drops) in 10.2 ml of benzene. The solution was refluxed with stirring for 30 minutes. After filtration of the solution, the filtrate was concentrated under reduced pressure. The resulting crystalline solid was recrystallized from ethanol to afford 1.00 g (62.4%) of yellowish-green platelets: mp 149.5-150.0° C. (lit. mp 150° C., Okukawa, et al., Chem. Pharm. Bull., 1974, 22(2), 448-451). 1H NMR (250 MHz) δ 8.47-8.45 (m, 2 H), 8.06-7.99 (m, 2 H), 7.90 (s, 1 H), 7.84-7.79 (m, 2 H), 7.58-7.50 (m, 3 H); 13C NMR (62.7 MHz) 190.5, 189.2, 147.2, 142.7, 140.2, 135.6, 135.4, 134.3, 133.4, 133.2, 129.3, 129.0, 123.5, 123.5 ppm.

Workup

  1. temperatureThe solution was refluxed
  2. filtrationAfter filtration of the solution
  3. concentrationthe filtrate was concentrated under reduced pressure
  4. customThe resulting crystalline solid was recrystallized from ethanol
  5. customto afford 1.00 g (62.4%) of yellowish-green platelets

Sources & evidence

ORD record
ord-1a7df1ec91ff4c14866d69c7210e6156
Source dataset
uspto-grants-2005_06
Patent number
US06906105B2

Reaction notes

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