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Text this: Intramolecular Conjugate Ene Reaction of γ-Difluoromethyl- and γ-Trifluoromethyl-α,β-Unsaturated γ-Butyrolactones

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            _____     _  __    _____     ______  
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   /   ||  | ||__    | ' //   | ||__    `____ `  
  | [] ||  | ||__    | . \\   | ||__    /___//   
   \__ ||  |_____||  |_|\_\\  |_____||  `__ `    
    -|_||  `-----`   `-` --`  `-----`   /_//     
     `-`                                `-`

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