B(Cl)(Cl)Cl.[CH:5]1[C:14]2[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=2)[CH:8]=[CH:7][C:6]=1[OH:15].[Cl-].[Al+3].[Cl-].[Cl-].[OH-].[Na+].Cl.CS[C:25]#[N:26]>ClCCCl>[C:25]([C:5]1[C:14]2[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=2)[CH:8]=[CH:7][C:6]=1[OH:15])#[N:26]To 6 ml of a solution of 2.02M of boron trichloride in 1,2-dichloroethane were added a solution of 1.44 g of β-naphthol in 30 ml of 1,2-dichloroethane, 0.82 ml of methyl thiocyanate and 1.33 g of aluminium chloride under ice-cooling. After stirring at room temperature for 3 hr., the reaction mixture was poured into 33 ml of 4N aqueous NaOH and stirred at 75°-78° C. on an oil bath for 30 min. The reaction solution was mixed with 30 ml of 6N HCl and extracted with ether. After drying the ether layer over anhydrous magnesium sulfate, the solvent was distilled off. The residue was recrystallized from ether-benzene to yield 1.49 g of 1-cyano-2-naphthol as crystals melting at 160°-161° C.
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