1(2H)-Phthalazinone → 4-[2-[1-Oxo-1,2-dihydrophthalazin-2-yl]ethoxy]benzaldehyde

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##STR31## The title compound (700 mg, 44%) was prepared from 1(2H)-phthalazinone (800 mg, 5.48 mmol) (Ref: Chemistry of Heterocyclic Compounds; Condensed Pyridazines including Cinnolines and Phthalazines, edited by R. N. Castle; John Wiley and Sons, 27, (1973) 375-441), 4-[2-bromoethoxy]benzaldehyde (1.25 g, 5.48 mmol) and K2CO3 (1.5 g, 10.96 mmol) by a similar procedure to that described in preparation 2, mp: 104-106° C.

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