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福山机理学习笔记A044-A047

  • 2026-01-11 12:40:13
福山机理学习笔记A044-A047
今天天气晴好，空气也非常好。晚上静下心来读几页书，复习几个福山机理。有些在前面人名反应中已经学过，不再详细赘述。
A044 邻二醇被高碘酸氧化，中间涉及环状过渡态。
A045 光延反应，温和的酯化反应。
A046 涉及到桥环的一个特殊反应。为方便理解机理，对重点基团编号如下图笔记，醇质子化后，水分子离去得到2号碳的碳正离子，要发生碳正离子重排，此碳正离子为非经典碳正离子。关于碳正离子的重排，需要逐个分析哪个烷基迁移，若是8号甲基迁移，会得到1号桥头正离子，不稳定，且后续会得到桥头双键，也不稳定。所以6号碳迁移到了2号碳正。最后发生一步E1消除，得到烯烃。
A047 经典的反应——频哪醇重排Pinacol rearangement
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  1. CONNECT:[ UseTime:0.000677s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000861s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000666s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000243s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000581s ]
  6. SELECT * FROM `set` [ RunTime:0.000539s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000567s ]
  8. SELECT * FROM `article` WHERE `id` = 459187 LIMIT 1 [ RunTime:0.010510s ]
  9. UPDATE `article` SET `lasttime` = 1768118420 WHERE `id` = 459187 [ RunTime:0.014286s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.007753s ]
  11. SELECT * FROM `article` WHERE `id` < 459187 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000643s ]
  12. SELECT * FROM `article` WHERE `id` > 459187 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000396s ]
  13. SELECT * FROM `article` WHERE `id` < 459187 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002088s ]
  14. SELECT * FROM `article` WHERE `id` < 459187 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005233s ]
  15. SELECT * FROM `article` WHERE `id` < 459187 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.011719s ]
0.155734s