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tetrahydropyran
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Tetrahydropyran (THP) 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 the reaction of alcohols and dihydropyran are common intermediates in organic synthesis. Furthermore, a tetrahydropyran ''ring system'', i.e., five carbon atoms and an oxygen, is the core of pyranose sugars, such as glucose. In gas phase, the THP exists in its lowest energy Cs symmetry chair conformation.
==Preparation==
One classic procedure for the organic synthesis of tetrahydropyran is by hydrogenation with Raney nickel of dihydropyran.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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