Iodine → 5-Bromonaphthalene-2-carboxylic acid
Reaction equation
[CH:1]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[CH:3][C:2]=1[C:11]([OH:13])=[O:12].[Br:14]Br.II>C(O)(=O)C>[Br:14][C:6]1[CH:7]=[CH:8][CH:9]=[C:10]2[C:5]=1[CH:4]=[CH:3][C:2]([C:11]([OH:13])=[O:12])=[CH:1]2Participants
5
Reactant 3
Product 1
Reagents, catalysts & solvents 1
Procedure
To a boiling solution of 2-naphthoic acid (10.00 g, 58.14 mmol) in acetic acid (50 mL) is added dropwise bromine (3 mL) containing iodine (0.25 g). After the addition is complete, the solution is refluxed for 0.5 hr. A white precipitate forms during cooling and is isolated by filtration, washed with acetic acid and then water. The solid is triturated in methanol (100 mL) and 7.01 g (53.4% yield) of the desired product is obtained as a white solid. m.p. 248-250° C. 1H NMR (300 MHz, CD3OD): δ 8.94 (d, J=1.8 Hz, 1H), 8.52-8.42 (m, 3H), 8.27 (dd, J=1.8, 7.5 Hz, 1H), 7.79 (t, J=8.4 Hz, 1H).