发明名称 |
PROCESS FOR PREPARING GAMMA-PYRONES |
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 |
CS203923(B2) |
申请公布日期 |
1981.03.31 |
申请号 |
CS19780003706 |
申请日期 |
1978.06.07 |
申请人 |
PFIZER INC.,US |
发明人 |
BRENNAN,THOMAS M.,US;BRANNEGAN,DANIEL P.,US;WEEKS,PAUL D.,U S;KUHLA,DONALD E.,US |
分类号 |
A23L1/221;C07D;C07D309/32;C07D309/38;C07D309/40;C11B9/00;(IPC1-7):C07D309/38 |
主分类号 |
A23L1/221 |
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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