发明名称 |
4-HALOGEN-DIHYDROPYRAN-FORBINDELSE OG FREMGANGSMAATE FOR FREMSTILLING DERAV |
摘要 |
Prepn. of a gamma pyrole of formula (I) comprises heating a 4-halo-dihydropyran of formula (II) or an 6,6'-oxy-bis 4-halo-2H-pyran-3(6H)-one of formula (V) in an aq. acid soln. until hydrolysis is practically complete. (where R is H, 1-4C alkyl, phenyl or benzyl; R' is H, 1-4C alkyl or -COR" where R" is methyl, ethyl or phenyl; R'" is H or 1-4C alkyl and X is Cl or Br). |
申请公布号 |
NO821849(A) |
申请公布日期 |
1978.02.03 |
申请号 |
NO19820001849 |
申请日期 |
1982.06.03 |
申请人 |
PFIZER INC., |
发明人 |
BRENNAN, THOMAS MOTT,;BRANNEGAN, DANIEL PATRICK,;WEEKS, PAUL DOUGLAS,;KUHLA, DONALD ERNEST, |
分类号 |
A23L27/10;C07D;C07D309/32;C07D309/38;C07D309/40;C11B9/00 |
主分类号 |
A23L27/10 |
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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