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柒捌玖鐵蟲 (初入文壇)
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[求助]
求翻譯一份論文摘要,急求 已有1人參與
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本文主要介紹了3-溴丁酸甲酯的合成工藝。3-溴丁酸甲酯作為重要的醫(yī)藥中間體,市場需求越來越大,國內(nèi)外對3-溴丁酸合成工藝的研究也越來越多。我們從多條合成工藝中選擇成本最低的一條的合成工藝來實現(xiàn)3-溴丁酸甲酯的工業(yè)化。首先以價格便宜的巴豆酸為原料,在70-80 ℃之間合成巴豆酸甲酯,在巴豆酸甲酯合成過程中嘗試了不同催化劑對對巴豆酸甲酯的合成收率的影響,得出濃硫酸的催化效果最好,巴豆酸甲酯的收率可達(dá)到95%。由第一步合成的巴豆酸甲酯乙酸做溶劑與溴化氫加成合成3-溴丁酸甲酯,探究不同反應(yīng)條件下3-溴丁酸甲酯的收率,得出當(dāng)實驗溫度為10℃,物料比(溴化氫:巴豆酸甲酯)為1.8:1的條件下3-溴丁酸甲酯的收率最高,可達(dá)90%。 關(guān)鍵詞:巴豆酸 巴豆酸甲酯 3-溴丁酸甲酯 |
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非專業(yè)的,僅供參考 This article mainly introduced the synthetic process of 3 - methyl bromide butyric acid.3 - methyl bromide butyric acid as an important pharmaceutical intermediates, market demand is more and more big, at home and abroad for 3 - bromine butyric acid synthesis technology research also more and more.We choose the lowest cost from multiple synthesis process of a synthetic process to realize the industrialization of 3 - methyl bromide butyric acid.Start with cheap crotonic acid as raw materials, synthesis between 70-80 ℃ crotonic acid methyl ester, in the process of crotonic acid methyl ester synthesis tried different catalysts on the yield of crotonic acid methyl ester synthesis, draw a sulfuric acid catalytic effect is best, crotonic acid methyl ester yield can reach 95%.By the first step in the synthesis of crotonic acid methyl acetate solvent and additive synthesis of 3 - methyl bromide butyric acid hydrogen bromide, explore different reaction conditions the yield of 3 - methyl bromide butyric acid, it is concluded that when the experiment temperature is 10 ℃, the material ratio (hydrogen bromide: crotonic acid methyl ester) of 1.8:1 under the condition of 3 - methyl bromide butyric acid yield was the highest, up to 90%. Keywords: crotonic acid, crotonic acid methyl 3 - methyl bromide butyric acid |
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