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 \ \\/ //  \ \\/ // |  __ \\    / _ \\  | || | || 
  \   //    \ ` //  | |  \ ||  / //\ \\ | '--' || 
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Text this: Intramolecular acylation of α-sulfinyl carbanions. A simple preparation of 4-oxygenated spiro[4.n]alk-2-ene-1-ones