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大四寫(xiě)論文金蟲(chóng) (正式寫(xiě)手)
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An efficient microwave-assisted synthesis of optically active polyamides in the presence of ionic liquid and conventional solvent: a comparative study Shadpour Mallakpour • Zahra Rafiee Received: 1 May 2010 / Revised: 10 June 2010 / Accepted: 10 June 2010 /Published online: 17 June 2010 Springer-Verlag 2010 Monomer synthesis Optically active dicarboxylic acid monomer 8 was synthesized according to previous publications (Scheme 1) [10, 20]. Polymer synthesis In the present study, several optically active PAs containing L-phenylalanine and anthracenic groups were synthesized based on the phosphorylation polyamidation technique of dicarboxylic acid 8 with various aromatic diamines by two systems of the condensing agent under microwave activation and properties of the resulting polymers were compared (Scheme 1). In the first method IL, [1,3-(pr)2im]Br in the presence of TPP was promoted polyamidation reactions, and microwave irradiation was applied as a source of heating for rapid synthesis of PAs and in the second method NMP/Py/TPP/CaCl2 system was employed as condensing agent under microwave activation. The mechanism of activation by TPP/IL is cited in [19]. The higher inherent viscosities and shorter reaction time were advantages of polymerization using method I than method II. The yields and thermal stability of the polymers were comparative under both conditions and all of the obtained PAs are white color. The results of the polymerization reactions are presented in Tables 1 and 2. |
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jiangguofeng
金蟲(chóng) (著名寫(xiě)手)
- 翻譯EPI: 248
- 應(yīng)助: 41 (小學(xué)生)
- 金幣: 25886.4
- 紅花: 25
- 帖子: 2100
- 在線(xiàn): 567.1小時(shí)
- 蟲(chóng)號(hào): 72410
- 注冊(cè): 2005-06-04
- 專(zhuān)業(yè): 合成藥物化學(xué)
【答案】應(yīng)助回帖
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大四寫(xiě)論文: 金幣+35, 翻譯EPI+1, ★★★很有幫助 2015-04-08 08:40:19
大四寫(xiě)論文: 金幣+35, 翻譯EPI+1, ★★★很有幫助 2015-04-08 08:40:19
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在離子液體和常規(guī)溶劑存在下，有效的微波輔助合成光學(xué)活性的聚酰胺： 比較研究 Shadpour Mallakpour ? Zahra Rafiee 2010五月一日／修訂: 2010六月十日／接收: 2010六月十日／網(wǎng)上發(fā)表: 2010六月十七日 Springer-Verlag 2010 單體合成 光學(xué)活性的二羧酸單體8按照先前的出版物(圖1) [ 10, 20]進(jìn)行合成。 聚合物的合成 在本研究中，基于二羧酸8與各種芳族二胺磷酰化聚酰胺化技術(shù)，通過(guò)兩個(gè)冷凝劑系統(tǒng)，在微波活化作用下合成了幾種帶有L -苯基丙氨酸和蒽基團(tuán)的光學(xué)活性的PA并且對(duì)比了形成的聚合物的性質(zhì)（圖1）。 第一個(gè)方法IL, 在TPP存在下，促進(jìn)[ 1,3 - ( pr) 2im] Br聚酰胺化反應(yīng),微波照射用作熱源，快速合成PA，而在第二個(gè)方法中NMP/Py/TPP/CaCl2系統(tǒng)是在微波活化作用下用作冷凝劑。通過(guò)TPP/IL的活化作用的機(jī)理在[19]中被引證。高特性粘度和較短的反應(yīng)時(shí)間是利用方法I比利用方法II進(jìn)行聚合更有利的優(yōu)勢(shì)。聚合物的收率和熱穩(wěn)定性在兩種情況下都是相當(dāng)?shù)牟⑶耀@得所有的PA都是白色的。聚合反應(yīng)的結(jié)果列于表1和表2。 |
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