- A SHORT, EFFICIENT, MULTIGRAM SYNTHETIC ROUTE TO 2,3-DIMETHYLFURAN AND SOME OF ITS 2-SUBSTITUTED DERIVATIVES
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A laboratory, multigram (1000 g in an hour) preparation procedure for 2,3-dimethylfuran, based on the frequently repeated thermal cyclization of (Z) 3-methyl-2-penten-4-yn-1-ol, as well as its subsequent formylation, acetylation and oxidation is described.
- Vegh, Daniel,Zalupsky, Peter,Kovac, Jaroslav
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p. 1113 - 1123
(2007/10/02)
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- Photochemistry of 4-Hydroxypyrylium Cations in Aqueous Sulfuric Acid
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4-Hydroxypyrylium cations that are known to undergo phototransposition to 2-hydroxypyrylium cations in concentrated sulfuric acid were observed to undergo photo-ring contraction in 50percent sulfuric acid.The initial products observed when the irradiations are carried out at 0 deg C are 4,5-dihydroxycyclopent-2-enones that can be isolated.At higher temperatures these initial products undergo secondary acid catalyzed thermal reactions to yield substituted acetylfurans.
- Pavlik, James W.,Spada, Alfred P.,Snead, Thomas E.
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p. 3046 - 3050
(2007/10/02)
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- Photochemistry of 4-Pyrones in Water. Formation of Dihydroxycyclopentenones and Furan Derivatives
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Irradiation of aqueous solutions of alkyl substituted 4-pyrones leads to the formation of dihydroxycyclopentenones.These primary products are also photolabile and in certain cases are photochemically converted to furan derivatives.
- Pavlik, James W.,Snead, Thomas E.,Tata, James R.
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p. 1481 - 1483
(2007/10/02)
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