ChemicalBook CAS DataBase List 1-Pyrenecarboxaldehyde

1-Pyrenecarboxaldehyde synthesis

6synthesis methods

Product Name:1-Pyrenecarboxaldehyde
CAS Number:3029-19-4
Molecular formula:C17H10O
Molecular Weight:230.26

129-00-0 Synthesis

129-00-0
322 suppliers
$9.00/1g

4885-02-3 Synthesis

4885-02-3
176 suppliers
$10.00/1g

3029-19-4
182 suppliers
$15.00/1g

Yield:3029-19-4 96%

Reaction Conditions:

with titanium tetrachloride in dichloromethane at 0 - 20; for 2.5 h;

Steps:

Synthesis of 1-hydroxypyrene (3)
To a stirred CH₂Cl₂ (90 mL) solution of pyrene (2.022 g, 10 mmol) was added Cl₂CHOCH₃ (1.2 mL, 13 mmol) at 0 °C. To the solution was slowly added TiCl₄ (2.0 mL, 18 mmol). The color of solution turned from yellow to purplish red. The mixture was stirred at 0 °C for 1 h and at room temperature for 1.5 h. The solution was poured into cold water (100 mL), and stirred until the color turned from purplish red to yellow. The mixture was extracted with CH₂Cl₂ (50 mL x 2). The combined organic layers were washed with brine (50 mL), separated, dried over MgSO₄, filtered, and concentrated in vacuo to give 1-formylpyrene (2.24 g, 96% yield). Yellow solid; ¹H NMR (400 Mz, CDCl₃) d 8.08-8.13 (m, 2H), 8.23-8.36 (m, 5H), 8.47 (d, J = 8.0 Hz, 1H), 9.45 (d, J = 9.6 Hz, 1H), 10.80 (s, 1H) ppm. To a stirred CH₂Cl₂ (20 mL) solution of 1-formylpyrene (0.46 g, 2 mmol) was added m-CPBA (0.68 g, 3 mmol), and the resulting solution was stirred at reflux for 24 h, then concentrated in vacuo. To the residue was added THF (5 mL), MeOH (5 mL), and 25% KOH aq (0.6 mL), giving a mixture that was stirred at room temperature for 4 h, then concentrated in vacuo. The residue was dissolved in 2% KOH aq (10 mL). The solution was extracted with CH₂Cl₂ (10 mL x 2). The combined organic layers were washed with ice-cooled HCl aq (pH = 2), separated, dried over MgSO₄, filtered, and concentrated in vacuo, giving as residue that was subjected to silica gel column chromatography (eluent; CHCl₃, Rf = 0.3) to give 1-hydroxypyrene (3, 0.223 g, 50% yield). Gray solid; ¹H NMR (400 Mz, CDCl₃) d 5.70 (brs, 1H), 7.48 (d, J = 6.4 Hz, 1H), 7.91 (d, J = 8.8 Hz, 1H), 7.96-7.99 (m, 2H), 8.03-8.07 (m, 2H), 8.10-8.13 (m, 2H), 8.35 (d, J = 7.6 Hz, 1H).