In chemistry, pyran, or oxine, is a six-membered heterocyclic, non-aromatic ring, consisting of five carbon atoms and one oxygen atom and containing two double bonds. The molecular formula is C5H6O. There are two isomers of pyran that differ by the location of the double bonds. In 2``H``-pyran, the saturated carbon is at position 2, whereas, i...
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http://en.wikipedia.org/wiki/Pyran
any of a class of organic compounds of the heterocyclic series in which five carbon atoms and one oxygen atom are present in a ring structure. Of ...
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http://www.britannica.com/eb/a-z/p/137
A cyclic compound that may be considered the formal parent of sugars with an oxygen bridge from carbon atoms 1 to 5 (the pyranoses). ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
(pi´ran) a cyclic compound in which the ring consists of 5 carbon atoms and 1 oxygen atom. Pyran.
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Type: Term Pronunciation: pī′ran Definitions: 1. A cyclic compound that may be considered the formal parent of sugars with an oxygen bridge from carbon atoms 1-5 (the pyranoses).
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either of two compounds having the formula CHO, containing one oxygen and five carbon atoms arranged in a six-membered ring.
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https://www.infoplease.com/dictionary/pyran
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