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- W2012075900 abstract "Abstract Aminophosphine-ylides 4a and 4b were prepared in high yields by treating 3-acetyl coumarins 1a and 1b with trisdimethylaminophosphine 2 . Chemical degradation reactions for the ylides 4a , b (e.g., formation of the phosphonium salt, Wittig reaction, hydrolysis) were suggested and illustrated. Reaction of trialkyl phosphites with 3-acetyl coumarins 1a and 1b yields the respective dialkyl phosphonates (1:4 addition) 12a , b . Conversely, dialkyl phosphonates react with the same species 1a , b to give the tautomeric monophosphonates 17A 17B via both 1,4- and 1,2 additions, in contrast to earlier reports." @default.
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- W2012075900 date "1999-12-01" @default.
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- W2012075900 title "Synthesis and reactions of phosphino- and phosphono substituted-coumarins" @default.
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