Sulfuric Acid → HCID 12810993, compound

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To a solution of the dimethyl 2-hydroxy-4-methyl-6-(3-hydroxy-3,7,11,15-tetramethyl-hexadecanyl)-benzene-1,3-dicarboxylate (5.17 g) in xylene (25 ml) at 10° was added sodium dihydrobis(2-methoxyethoxy) aluminate (20 ml of a 70% by weight solution in benzene) over 20 min with occasional cooling to keep the temperature at 10°. After 10 min the solution was heated to reflux for 1.5 hr, cooled to 10° and was poured cautiously into cold 20% by weight aqueous sulfuric acid (200 ml). The mixture was extracted with ether (3× 100 ml) and the combined extracts were washed with aqueous sodium bicarbonate and brine and dried (Na2SO4) and concentrated on a rotary evaporator to give 4.29 g of crude 2,3,6-trimethyl-5-(3-hydroxy-3,7,11, 15-tetramethylhexadecanyl)-phenol as a light yellow oil. Chromatography on silica gel eluting with ether in petroleum ether gave 3.19 g of pure 2,3,6-trimethyl-5-(3-hydroxy-3,7,11,15-tetramethylhexadecanyl)-phenol.

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