Diethyl Ether → 3,4-Dinitrobenzaldehyde

A solution of (3,4-dinitro-phenyl)-methanol (95.3 g, 481 mmol) in methylene chloride (500 mL) was added all at once to a suspension of pyridinium chlorochromate (156 g, 722 mmol) in methylene chloride (900 mL). The mixture was stirred at room temperature for 1.5 h and then ether (1500 mL) was added. The supernatant was decanted from the resulting black gum, and the insoluble residue was washed thoroughly with methylene chloride (3×250 mL). The combined organic solution were filtered through a pad of florisil to afford a light bright yellow clear solution. Solvents were removed in vacuo and the residue was purified by silica gel chromatography using methylene chloride as eluent to afford the title compound as a yellow solid (71%). 1H-NMR (CDCl3, 300 MHz) δ 8.45 (d, J=1.5 Hz, 1H), 8.28 (dd, J=8.1, 1.5 Hz, 1H), 8.07 (d, J=8.1 Hz, 1H). 13CNMR (CD3OD, 125 MHz) δ 187.7, 139.2, 134.2, 126.2, 125.7.

1. customThe supernatant was decanted from the resulting black gum
2. washthe insoluble residue was washed thoroughly with methylene chloride (3×250 mL)
3. filtrationThe combined organic solution were filtered through a pad of florisil
4. customto afford a light bright yellow clear solution
5. customSolvents were removed in vacuo
6. customthe residue was purified by silica gel chromatography

ORD record

ord-6a1967e1320f470a98dff746011c4454

Source dataset

uspto-grants-2010_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07842808B2