有機(jī)合成氧化ppt課件(參考版)
2025-05-07 23:55本頁(yè)面
【正文】 hindered alcohols show a reduced activity. Fetizon’s Regent Fetizon found that reaction of primary alcohol give excellent yields of the corresponding aldehyde when silver carvonate is condensed on Celite. Silver (I) oxide Selective oxidation of aldehydes to carboxylic acids. Example Silver (II) oxide Silver (II) oxide can convert aldehyde or alcohols to carboxylic acids. The isomerization of conjugated double bond is avoided. Other oxidation regents DessMartin periodinane oxidation Mild oxidizing regent for converting alcohols or aldehydes to ketones under neutral condition. Example Oxidation with oxammonium salt This regent is patible for the mild oxidation of many alcohols, including alipharic primary and secondary as well as allylic and benzylic alcohol. One group disconnections CM eM e C NO HM eM eOCM eM eC NO HN a C NH +Example CP hM eO HC C HH C C HN aL i q u i d N H 3P hM eOH C C CP hM eO HC C HExample P hP hO HP hP hO HC O 2 E t2 P h M g B r+C O 2 E t+C O 2 E tExample B r+O HO Ho rH C C H1 . N a , L i q u i d , N H 32 . a c e t o n eO HH 2 , P d CB a S O 4O HH B rB rExample OO1 . B a s e , C H 2 O2 . B a s e , C H 2 OH OH OH 2 P d CB a S O 4H OO HA c e t o n eH+OO1. Epoxides from halohydrins Halohydrins can be synthesized by the reaction of alkenes and hypohalous. Subsequent treatment of with a base such as sodium hydride generates the alkoxide, which is anti to the adjacent bromine. 2. Peroxides induced epoxidations ?Hydrogen peroxide ?Alkyl hydroperoxides ?Organic peroxyacids Hydrogen peroxide Solvent: Water or water miscible solvents Metal catalysts: V2O5, WO3, MoO3H The hydroxy
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