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  • Although the pyrans themselves have little significance in chemistry, many of their derivatives are important biological molecules: 4H-Pyran easily disproportionates to the corresponding dihydropyran and the pyrylium ion, which is easily hydrolyzed in aqueous medium. — “Pyran - Wikipedia, the free encyclopedia”,
  • Wikimedia Commons has media related to: Pyrans. Subcategories. This category has only the following subcategory. Pages in category "Pyrans" The following 4 pages are in this category, out of 4 total. This list may not reflect recent changes. — “Category:Pyrans - Wikipedia, the free encyclopedia”,
  • The Ferrier carbocyclization (or Ferrier II reaction) is an organic reaction that was first reported by the carbohydrate chemist Robert J. Ferrier in 1979.[1][2] It is a metal-mediated rearrangement of enol ether pyrans to cyclohexanones. Typically,. — “Ferrier carbocyclization - Wikipedia, the free encyclopedia”,


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