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| Mikami et al in 2004 reported to the natural lactic acid ester as raw materials for 1 - Alkylimidazolium prepared to carry out alkylation CILs, which has a low melting point CILs advantages. Tao in 2005, and other opponents of direct reports §Ñ-§Ñ-amino acids or amino acid ester prepared to carry out a series of CILs. Bao reported in 2003, such as the use of natural chiral amines and amino acids with the direct synthesis of chiral center Alkylimidazolium, alkylation Preparation CILs, the method is easy to get raw materials, chemical stability, low melting point and simple steps, such as Advantages. CILs made in the Asymmetric Synthesis possible. Levillain such as the use of low-cost - amino -1 - butanol and two of the S 2 - C methyl ester preparation for condensation thiazoline, and then through the alkylation prepared a series of new CILs. The CILs have good thermal stability in alkaline conditions is stable, even under the acidic conditions of a certain degree of stability. Ge'nisson, such as in 2005 and reported from the hands of the starting amine. A series of 2 - alkyl substituted imidazole salt CILs and the corresponding dihydro the imidazole salt CILs, the type of CILs have a very low melting point, in asymmetric synthesis potential value. In 2005, Baro, such as the use of chiral reagents for the alkylation ¢ô - methylimidazole for alkylation, with a synthetic liquid nature of the CILs. |
2Â¥2008-12-28 02:45:09
lirenxing
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3Â¥2008-12-28 09:17:55
ling1007
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4Â¥2008-12-29 07:25:23
lirenxing
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5Â¥2008-12-29 09:10:35
ling1007
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Alkylimidazolium with chiral center was directly synthesized using natural chiral amines and amino acids, then alkylation preparation CILs was reported in 2003 by Bao,etc. The method owns adwantages of raw materials is easy to get, chemical stability is good, steps are simple and melting Point is low,etc. Application of the CILs in asymmetric synthesis becomes possible. Cheap amino-1¨Cbutanol and two sulpho-2-methyl propionate were adopted to condensation prepare thiazoline,then a series of new type CILs were prepared with alkylation by Levillain etc. The CILs own good thermal Stability, stable under alkaline conditions, and even own some stability under acidic conditions also. Synthesis a series of 2-alkyl substitutive imidazole salt CILs and corresponding two hydrogenation imidazole salt CILs starting from chiral amines was reported in 2005 by Ge¡änisson, etc. The type of CILs owns very low melting Point, snd owns potential application value in asymmetric Synthesis. In 2005, alkylation ¢ô-methylimidazole was carried out with chiral alkylation reagent and a kind of CILs with nature of liquid crystal was synthesized by Baro, etc No thanks. ˳±ã×£ÄãÐÂÄê¿ìÀÖ£¡´º½Ú¿ìÀÖ£¡ |
6Â¥2008-12-30 07:14:44
ling1007
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7Â¥2008-12-30 12:07:30
lirenxing
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