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Reagents: (a) NaNO2, HCl; (b) ethyl 2-chloro-acetoacetate, CH3COONa, ethanol; (c) 4-methoxybezoylacetonitrile 8c, sodium ethanolate; (d) sodium ethanolate, CH3CN; (e) ethyl 2-chloro-2-(2-(2,4-dichlorophenyl)hydrazono)acetate 9d, sodium ethanolate.
