Benzoyl Peroxide → 5-(Bromomethyl)-2-methoxy-1-(trifluoromethyl)naphthalene

Participants

Reaction Steps

A suspension of 2-methoxy-5-methyl-1-(trifluoromethyl)naphthalene (1.2 g, 5.0 mmol), N-bromosuccinimide (1.07 g, 6.0 mmol) and benzoyl peroxide (20-30 mg) in carbon tetrachloride (10 mL) was heated at reflux for 1.5 hr. The residual solid in the reaction mixture was removed by filration, and the collected solid on the filter was washed with methylene chloride. The combined filtrates were washed with water, dried (MgSO4) and evaporated to give 1.7 g of 5-(bromomethyl)-1-(trifluoromethyl)-2-methoxynaphthalene (IX, R=CH3 and R1 =CH2Br) which was used in the next step without purification. Crystallization of a sample from hexane furnished pure 5-(bromomethyl)-1-trifluoromethyl-2-methoxynaphthalene having mp 97°-99° C.; nmr (CDCl3) δ 3.95 (s, 3H), 4.85 (s, 2H), 7.7 (m, 5H); ir (CHCl3) 1265, 1125 cm-1 ; uvλmax (MeOH) 339 nm (ε 3,510), 326 (3,280), 300 (7,230), 288 (7,150), 229 (44,150); Anal Calcd for C13H10BrF3O: C, 48.93% H, 3.16%; Found: C, 48.88% H, 3.14%.

Provenance & Evidence