发明名称 |
A PROCESS FOR PREPARING ENVIRONMENTALLY SAFE DICOFOL AND ITS FORMULATIONS |
摘要 |
<p>The present invention provides for an improved practical process for producing DDTr-free p,p min -dicofol and its formulations substantially free of the practically inactive o-p min -dicofol comprising either directly recrystallizing technical dicofol from a suitable solvent such as acetic acid or alkanes, or alternatively preparing the p,p min -dicofol by the steps of (a) dehydrohalogenating technical DDT to give DDE; (b) chlorinating DDE to give Cl-DDT; and (c) hydrolyzing Cl-DDT to dicofol, wherein the technical DDT is initially recrystallized from a suitable solvent such as lower alkyl alcohols and then recrystallizing the resulting p,p min -dicofol from a suitable solvent such as acetic acid or alkanes.</p> |
申请公布号 |
EP0383054(A3) |
申请公布日期 |
1992.01.29 |
申请号 |
EP19900101212 |
申请日期 |
1990.01.22 |
申请人 |
AGAN CHEMICAL MANUFACTURERS LTD. |
发明人 |
VAISBUCH, BERNARD;SHIFMAN, BENJAMIN;PIKARSKI, MICHAEL |
分类号 |
A01N25/14;A01N31/04;C07C29/124;C07C29/78;C07C33/46;(IPC1-7):C07C33/46;C07C25/20;C07C17/38 |
主分类号 |
A01N25/14 |
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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