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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