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03240331银虫 (小有名气)
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[交流]
求高手帮忙翻译论文摘要（60金币）
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求高手帮忙翻译论文摘要（60金币） 氧代异佛尔酮（KIP）是合成维生素E的重要中间体，它可以通过异佛尔酮氧化生成。目前有两种合成途径，第一条路线为α-异佛尔酮异构化为β-异佛尔酮，然后再氧化β-异佛尔酮制得KIP；第二条路线为直接氧化α-异佛尔酮制备。在第一条路线中由于α-异佛尔酮的共轭效应，使得α-异佛尔酮异构化为β-异佛尔酮的过程中需要很高的温度，且仅有4%左右的转化率。另外传统上对异佛尔酮的催化氧化基本都是包含金属的催化体系和有机溶剂参与的反应体系，这对环境污染产生严重的影响。因此本论文的研究选用以α-异佛尔酮直接氧化的路线，且根据绿色化学的原则，以氧气为氧化剂，用一种无金属参与的N–羟基邻苯二甲酰亚胺为催化剂催化α-异佛尔酮，为氧代异佛尔酮的制备提供一条全新的途径。 本论文首先采用N–羟基邻苯二甲酰亚胺为催化剂，在有机溶剂和有机助催化剂的参与下对α-异佛尔酮进行非金属的催化氧化研究，在整个反应中完全避免了金属的参与，且反应低，能耗少，操作方便，因而是一种绿色的氧化路线，进一步对影响反应的因素如温度、催化量等进行优化，产物的选择性可以达到90%左右。 其次，本论文还考察了在无溶剂和不加任何的助催化剂的条件下对α-异佛尔酮的催化氧化，发现仅用催化量的N–羟基邻苯二甲酰亚胺即可有效的催化氧化α-异佛尔酮，在60度的温度下，产物的选择性可超过75%。 最后，本论文对这一反应过程的机理进行了研究，通过对反应过程的分析，结合ESI-MS和GC-MS等对反应产物及反应中间体的检测、以及相关底物的实验对比手段，提出了α-异佛尔酮非金属催化氧化的自由基反应机理，并。这个机理的提出，不仅解释了反应中副产物产生的原因，为进一步提高目标产物的实验设计提供了新的路线，同时也为推测和验证相关体系的氧化反应机理提供了新的思路。 |
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2楼2010-01-19 15:36:59
2008000465
木虫 (小有名气)
- 应助: 1 (幼儿园)
- 金币: 2236.8
- 帖子: 281
- 在线: 124.4小时
- 虫号: 885733
- 注册: 2009-10-27
- 性别: MM
- 专业: 高分子合成化学
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
03240331(金币+20):非常感谢，麻烦您帮我把剩下的翻译一下啊。谢谢您了 1-23 13:18
03240331(金币+20):非常感谢，麻烦您帮我把剩下的翻译一下啊。谢谢您了 1-23 13:18
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Oxo-isophorone (KIP)prepared by isophorone oxidation is an important intermediate of synthesis of vitamin E. There are two kinds of synthetic pathway for KIP, the first route is to isomerize α-isophorone into a β-isophorone, and then oxidize β-isophorone into the product; the second route is direct oxidation of α-iso-Isophorone into the product. In the first route, the isomerization process of α-isophorone into a β-isophorone requires high temperatures, and only about 4% of the conversion was obtained for the conjugate effect of α-isophorone. Moreover, the traditional catalytic oxidation system of isophorone contains metal and organic solvents, which cause environmental pollution. Therefore, this paper selected the direct oxidation route to synthesize α-isophorone, and according to the principles of green chemistry, oxygen was used as the oxidant, with non-metal N-hydroxy-phthalimide as catalyst, for preparation of Isophorone. 先第一段，太长了 |
3楼2010-01-22 08:14:55
2008000465
木虫 (小有名气)
- 应助: 1 (幼儿园)
- 金币: 2236.8
- 帖子: 281
- 在线: 124.4小时
- 虫号: 885733
- 注册: 2009-10-27
- 性别: MM
- 专业: 高分子合成化学
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
03240331(金币+20):辛苦了 1-24 18:50
03240331(金币+20):辛苦了 1-24 18:50
| In this paper, firstly we studied the non-metallic catalytic oxidation of α-isophorone using N-hydroxy-phthalimide as a catalyst in the presence of organic co-catalysts and solvents. The completely avoiding of metal usage, a low energy consumption and convenient operation make the oxidation route a green process. Moreover, by optimizing reaction factors such as temperature, catalyst amount, etc., high product selectivity to 90% can be reached.Secondly, the paper examined the catalytic oxidation of α-isophorone in the absence of solvent and co-catalyst. We found only catalytic amount of N-hydroxy phthalimide can be an effective for catalytic oxidation of α-isophorone at 60℃, and the product selectivity can exceed 75%.Finally, this paper studies the mechanism of this reaction by analysis of reaction process, using ESI-MS and GC-MS technique to monitor reaction products and the reaction intermediates, and comparison of related substrates. We proposed the non-metallic α-isophorone catalytic oxidation is a free radical reaction. The mechanism proposed not only explains the cause of byproduct formed in the reaction which can provide new synthetic route of improving target product, but also provides a new route to speculate and verify mechanism of other oxidation reactions related. |
4楼2010-01-23 19:22:25
