Abstract
Abstract: An efficient, 5‑Sulphosalicylic acid (5-SSA) catalysed green protocol for the synthesis of Indenopyrazolones and its derivatives is reported under metal-free conditions in an ethyl lactate system. The main advantages of this procedure include the use of an organocatalyst, ethyl lactate as a recyclable promoting media, practical simplicity, high yields, shorter reaction times, atom economy, and ease of isolation of the product. These results showed that aromatic aldehydes with electron- withdrawing groups reacted faster than aldehydes with electron-releasing groups as expected. According to these observations, aromatic aldehydes with electron-withdrawing groups reacted more quickly than aldehydes with electron-releasing groups.
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