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b2003030181(金币+50, 翻译EPI+1): 2010-04-09 08:41
我做l了语法上的修改并稍加润色：
你第一段里的逗号用得都不对。逗号只能隔开短语或从句，完整句必须用句号分隔
Optically active ionic liquid has been intesively studied in modern organic chemistry society. They caught scientists' attentions due to their unique properties, wide application range and meanwhile environmental friendliness. The synthetic technologies of optically active ionic liquid are diversely varied while still present some general problems such as synthetic difficulty and high cost. Therefore, the research was motivated by the idea of looking for less costly chiral sources and facilitating the route in synthesizing optically active ionic liquid.
Amino acid is a cheap and easily accessible chiral source in nature. In this paper, leucine and phenylalanine as two kinds of natural chiral sources are selected and the preparation is carried out in a mild condition using a simplified method. In the product, there exist three rigid five-membered rings which stablized the conformation and chirality. This paper is mainly focused on following two parts:
1.The precursor of the targeted product - chiral bidentate nitrogen ligand 2,2 '- bis- oxazoline from leucine and phenylalanine was sucessfully prepared and characterized by 1H NMR and elemental analysis. That step conclude the preparation work for the synthesis of optically active ionic liquids.
2. Through the formation of imidazole ring, We presented the targeted product from chiral bidentate nitrogen ligand. Six different types of optically active ionic liquids are prepared in a series by anion-exchange reactions and they were characterized by means of 1H NMR, IR spectroscopy and elemental analysis. The solubility and melting point of the product were successively measured. The stability of some of the selected products were investigated by TG analysis. Their desired features like low melting point, good solubility and thermal stability allow them to participate into more exothermal reactions and thereafter broaden the application range.
[ Last edited by rain841230 on 2010-4-8 at 13:54 ] |
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