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By the method of Preparation 1, except that a reaction time of 1 hour at 0° C. was employed, 2-methylnaphthalene (10 g., 0.070 mole) in 200 ml. of methylene chloride was reacted with titanium tetrachloride (52.6 g., 30.5 ml., 0.28 mole) and 1,1-dichloromethyl methyl ether (24.1 g., 0.21 mole). The crude product, obtained as an oil, was distilled, yielding 12.2 g. of distillate b.p. 155°-160° C./2.3-3.0 mm. On standing, crystalline product separated from the distillate. Filtration gave purified 2-methyl-1-naphthaldehyde (0.53 g., m.p. 48°-50° C.).

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2. customexcept that a reaction time of 1 hour
3. customat 0° C.