2-Chloropyridine → Pyriproxyfen

Participants

Reaction Steps

A mixture of 1-methyl-2-(4-phenoxyphenoxy)ethanol (2.0 g, 8.2 mmol), 2-chloropyridine (4.0 g, 35 mmol), flaked 95% sodium hydroxide (1 g, 24 mmol) and tetra-n-butylammonium bromide (0.13 g) was stirred at an inner temperature of 85° to 90° C. for 6 hours. After allowed to cool, toluene (10 g) was added thereto, and the resultant mixture was washed with water and extracted with 35% hydrochloric acid (5 g) twice. The hydrochloric acid layer was washed with toluene (10 g). A 10% aqueous sodium hydroxide solution was added thereto to make the mixture sufficiently basic. The basic mixture was further extracted with toluene (10 g) twice, and the toluene layer was washed with a 10% aqueous sodium hydroxide solution and a saturated aqueous sodium chloride solution in order and dried over anhydrous magnesium sulfate. After removal of the solvent, the residue was purified by silica gel column chromatography to give 2-[ 1-methyl-2-(4-phenoxyphenoxy)ethoxy]pyridine (1.87 g) as white crystals.

Provenance & Evidence