发明授权
US4256643A 3-Chloro-3-methyl-butane-1,4-dial-bis-acetals and
3-methyl-but-2-ene-1,4-dial-bis-acetals, a process for the preparation
of these compounds and their use
失效
3-氯-3-甲基 - 丁烷-1,4-二 - 双 - 缩醛和3-甲基 - 丁-2-烯-1,4-二 - 双 - 缩醛，这些化合物的制备方法及其 使用
- 专利标题： 3-Chloro-3-methyl-butane-1,4-dial-bis-acetals and 3-methyl-but-2-ene-1,4-dial-bis-acetals, a process for the preparation of these compounds and their use
- 专利标题（中）： 3-氯-3-甲基 - 丁烷-1,4-二 - 双 - 缩醛和3-甲基 - 丁-2-烯-1,4-二 - 双 - 缩醛，这些化合物的制备方法及其 使用
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申请号： US76412申请日： 1979-09-17
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公开(公告)号： US4256643A公开(公告)日： 1981-03-17
- 发明人: Hagen Jaedicke , Joachim Paust
- 申请人： Hagen Jaedicke , Joachim Paust
- 申请人地址： DEX
- 专利权人： BASF Aktiengesellschaft
- 当前专利权人： BASF Aktiengesellschaft
- 当前专利权人地址： DEX
- 优先权： DEX2842715 19780930
- 主分类号： C07D319/06
- IPC分类号： C07D319/06 ; C07D319/04
摘要：
3-Chloro-3-methyl-butane-1,4-dial-bis-acetals and 3-methyl-but-2-ene-1,4-dial-bis-acetals are obtained by reacting a six-membered cyclic acetal of 3-methyl-but-3-en-1-al with an alkyl nitrite in the presence of methanol and hydrogen chloride and, if desired, eliminating HCl in the conventional manner.The butanedial-bis-acetals and butenedial-bis-acetals are valuable intermediates through which the trans-3-methyl-but-2-ene-1,4-dial-1-acetals, which are sought-after products for terpene syntheses, can be obtained in an industrially particularly advantageous manner.