Hydrochloric Acid → 2-(2H-Benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol

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反応条件

反応手順

To a 5-liter 3-necked flask fitted with a stirrer, thermometer, reflux condenser and nitrogen inlet was charged 386 grams (0.805 mol) of the o-nitroazobenzene intermediate of Example 2 and 1200 ml of toluene. To the resulting solution was added 240 ml of isopropanol and 240 ml of water. A nitrogen atmosphere was imposed and 160 ml of 50.15 aqueous sodium hydroxide was added. A flask containing 158.2 grams (2.42 gram-atoms) of zinc was connected to the reaction flask by Gooch rubber tubing and the zinc dust was added portionwise to the reaction mixture over a 90-minute period. The zinc was added at such a rate to keep the internal temperature between 40° and 45° C. After the zinc was all added, the reaction mixture was heated for 1 hour at 40° C. and then for 3 hours at 70° C. The mixture was cooled to room temperature and acidified with 600 ml of concentrated hydrochloric acid.

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