Hydrochloric Acid → 3-(Benzothiazol-2-yl)-4-Phenyl-2-(5H) Furanone

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A solution of 2-acetoxyacetophenone (from Example 1) (8.9 g, 0.05M) and α-(benzothiazol-2-yl)-acetate (from Example 3) dissolved in methanol (40 mL) by stirring at room temperature was treated at room temperature with a solution prepared by dissolving sodium hydroxide pellets (2.5 g) in methanol (30 mL) by stirring. A slight exothermic reaction was observed. After being stirred at about room temperature for about 1.0 hour, the reaction mixture was acidified to a pH of about 4 by the dropwise addition of concentrated HCl. The product which was a dark brown colored semi-crystalline mass was washed by decantation and dried in air (yield--12.0 g (81.9% of the theoretical yield). Mass spectrometry indicated that the product largely consisted of the following desired compound: ##STR16##

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