how is excess zinc removed from the reaction mixture
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Answer:
,5-dibromonitrobenzene (16.86 g, 60 mmol) and potassium carbonate anhydrous (82.93 g, 600 mmol) were added in 89.89 mL of dry dimethyl sulfoxide (DMSO) under the nitrogen atmosphere. The reaction mixture was then heated up to 50oC. Another set of solution mixture was prepared by placing diethyl malonate (48.05 g; 300mmol) into 44.94 mL of DMSO after which this solution mixture was added dropwise to the heated reaction mixture for more than an hour. After that, the reaction was allowed to react for 18 hours. After that, the reaction mixture was extracted three times using diethyl ether. The collected organic phase was washed with distilled water and light yellow oil mixture was obtained. This mixture was found to contained diethyl-2-(4-bromo-2-nitrophenyl) malonate and diethyl malonate.