1. 
   Tetrahydropyran
   Tetrahydropyran is the organic compound consisting of a saturated six-membered ring containing five carbon atoms and one oxygen atom. The compound is a colourless volatile liquid, but is obscure. Derivatives of tetrahydropyran are, however, more common. Tetrahydropyranyl (THP-) ethers derived from ...
   Found op http://en.wikipedia.org/wiki/Tetrahydropyran
   
   
2. 
   tetrahydropyran
   (from the article `pyran`) ...atom are present in a ring structure. Of two possible simple pyran compounds, only one is known; it was prepared in 1962 and found to be very ...
   Found op http://www.britannica.com/eb/a-z/t/30
   
   

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