Text this: Alkene synthesis using phosphonium ylides as umpolung reagents

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