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What is the meaning of fused for this: 1.0 mol of diamine was dissolved in DMf. Maleic anhydride (2.1 mol) as a DMF solution was added dropwise over a period of 10 min at RT. The solution was maintained at 50 °c for 2 h in a thermoregulated bath. Cyclization of aminic acid was carried out by adding an excess amount of fused sodium acetate and acetic anhydride mixture.
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In this context, "fused" refers to the physical state of sodium acetate. 'Fused sodium acetate' means the sodium acetate has been melted and solidified into a solid mass. This is often done to ensure that the sodium acetate is anhydrous (free of water), which is important for the cyclization reaction. The anhydrous sodium acetate acts as a base, removing a proton from the aminic acid to facilitate ring formation.
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