发明名称 |
METHOD FOR OBTAINING 5-HALOGENOLAEVULINIC ACID ALKYL ESTERS |
摘要 |
The invention relates to a method for obtaining a 5-bromolaevulinic acid methyl ester (or a 5-chlorolaevulinic acid methyl ester) from a bromination mixture (or a chlorination mixture) containing a 5-bromolaevulinic acid methyl ester (or a 5-chlorolaevulinic acid methyl ester) and produced by means of bromination (or chlorination) of laevulinic acid or a laevulinic acid methyl ester. The inventive method comprises the following steps: a) said bromination mixture (or chlorination mixture) is dissolved in an organic solvent or solvent mixture; b) the solution is cooled to a low temperature, preferably to a temperature which is lower than -20 °C, especially in the temperature range between -20 °C to -40 °C; c) the 5-bromolaevulinic acid methyl ester (or 5-chlorolaevulinic acid methyl ester) is crystallised out of the solution; and d) the crystalline 5-bromolaevulinic acid methyl ester (or 5-chlorolaevulinic acid methyl ester) is isolated by draining off the solution with the remaining bromination mixture (or chlorination mixture). |
申请公布号 |
WO03045895(A2) |
申请公布日期 |
2003.06.05 |
申请号 |
WO2002DE04302 |
申请日期 |
2002.11.22 |
申请人 |
MARIOTTI, ANTONIA;ALDENKORTT, SVEN |
发明人 |
MARIOTTI, ANTONIA;ALDENKORTT, SVEN |
分类号 |
C07C67/03;C07C67/307;C07C67/317;C07C67/52 |
主分类号 |
C07C67/03 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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