2,6-Di-tert-butylphenol → HCID 15027745, compound

Participants

Reaction Steps

To a solution of 20.6 g (0.1 mole) of 2,6-di-tert-butylphenol and 15.6 g (0.107 mole) of 5-methylisoxazole-3-carboxylic acid chloride in 100 mL of CS2 is added 14.3 g (0.107 mole) of AlCl3 at +5° C. Vigorous stirring is maintained at that temperature for 1 hour and then at room temperature for 1 hour. The CS2 is decanted off and the residue treated with 350 mL of ice cold 1N HCl and extracted with Et2O. The extracts are washed with saturated NaHCO3 solution and brine, dried with Na2SO4 and evaporated to give a mixture of products. The desired product is separated by flash chromatography (0% to 50% CH2Cl2 /n-hexane) on silica gel to give 4.4 g of the crude ketone which is recrystallized from n-pentane to give 2.3 g (14%) of pale yellow crystals, [3,5-bis(1,1-dimethylethyl)-4 -hydroxyphenyl(5-methyl-3-isoxazolyl)methanone, mp 120° C.; 1H NMR (CDCl3) δ 1.48 (s, 18H, tert-butyl), 2.52 (s, 3H, CH3), 5.85 (s, 1H, OH), 6.48 (s, 1H, isoxazole aromatic), 8.23 (s, 2H, phenyl aromatics); IR (KBr) 1590, 1600, 1650, 3600 cm-1 ; MS (DEI) m/e 315 (M+), 300 (M-CH3).

Provenance & Evidence