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 \ \\/ //   / _ \\   | \| ||  |  ___|| | || | || 
  \   //   | / \ ||  |  ' ||  | ||__   | '--' || 
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 /_//\_\\   \___//   |_|\_||  |_____|| |_|| |_|| 
 `-`  --`   `---`    `-` -`   `-----`  `-`  `-`

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Text this: W(CO)5(L)-catalyzed cyclization of α-alkynyl-β-dicarbonyl derivatives : synthesis of methylenelactones, furans, and methylenecyclopentanes