Formaldehyde → 5,8-dimethyl-6-(1,1-dimethylethyl)-4H-1,3-benzodioxin

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Reaction of 2,5-dimethyl-4-(1,1-dimethylethyl)-phenol (20.2 g, GLC purity 88%, 0.1 mol, which may be prepared as described by W. Weinrich, Ind. Eng. Chem. (1943) 35, 264-272), 40% formaldehyde solution (80 mL, 1.07 mol), p-dioxane (170 mL) and sulfuric acid (10 mL) according to the procedure described in Example 2, provided after distillation 13.05 g (59% yield, GLC purity 97%) of 5,8-dimethyl-6-(1,1-dimethylethyl)-4H-1,3-benzodioxin, bp 139° C., 3 mm; 1H-NMR (CDCl3)δ 1.40 (9H, s), 2.21 (6H, s), 4.79 (2H, s), 5.14 (2H, s); 7.01 (1H, s); IR (film)νmax 2940, 1580, 1475 cm-1 ; MS m/e 220, 205, 190, 185, 147; UVλmax (ethanol) 225 nm (ε=4270), 281 nm (ε=1490).

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