发明名称 |
PREPARATION OF HIGHER ALKYL ESTERS OF CARBOXYLIC ACIDS |
摘要 |
Larger (C6-C12) esters of substituted 2-pyridinyloxyalkanoic acids, such as 1-methylheptyl (4-amino-3,5-dichloro-6-fluoro-2-pyridinyloxy)acetate, are prepared in high yield and purity by first preparing the methyl or ethyl ester and then transesterifying with a C6-C12 alcohol. The methyl or ethyl ester can be prepared by alkylation of an alkali metal salt of 4-amino-3,5-dichloro-6-fluoro-2-pyridinol with methyl or ethyl chloroacetate and the transesterification can be carried out in the presence or a tetraalkyl titanate catalyst.
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申请公布号 |
CA2036017(C) |
申请公布日期 |
2001.07.24 |
申请号 |
CA19912036017 |
申请日期 |
1991.02.08 |
申请人 |
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发明人 |
KING, IAN R.;KRUMEL, KARL L.;LEE, SIMON C. |
分类号 |
A01N43/40;B01J31/38;C07B61/00;C07C69/14;C07D213/16;C07D213/73;(IPC1-7):C07D213/73 |
主分类号 |
A01N43/40 |
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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