- REGIOSPECIFIC SYNTHESIS OF 2-SUBSTITUTED 4-METHYL-3,6-DIHYDRO-2H-PYRANS
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The chloroalkylation of 3-halo-2-methyl-1-buten-4-ols was used to synthesize 4,5-dihalo-4-methyl-2-substituted tetrahydropyrans, which were converted regiospecifically to 3,6-dihydropyrans by reaction with magnesium.A similar reaction with zinc dust gave mixtures of 3,6- and 5,6-dihydropyrans.
- Kazaryan, P. I.,Avakyan, O. V.,Avakyan, S. V.,Gevorkyan, A. A.
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- Heteropoly acid catalysts in Prins cyclization for the synthesis of Florol
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H3PW12O40 heteropoly acid supported on SiO2 and its bulk acidic cesium salt Cs2.5H0.5PW12O40 are demonstrated to be highly active and recyclable solid catalysts for Pr
- de Meireles, Augusto L.P.,da Silva Rocha, Kelly A.,Kozhevnikova, Elena F.,Kozhevnikov, Ivan V.,Gusevskaya, Elena V.
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- PRODUCTION OF 2-SUBSTITUTED 4-METHYL-TETRAHYDROPYRANS FROM STARTING MATERIALS CONTAINING 2-ALKYL-4,4-DIMETHYL-1,3-DIOXANES
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The invention relates to a method for producing 2-substituted 4-methyltetrahydropyrans of general formula (I) from starting materials containing at least one 2-substituted 4,4-dimethyl-1,3-dioxane of general formula (II).
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Paragraph 0257
(2017/04/13)
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- 1,2-ELIMINATION OF ALCOHOL FROM HOMOALLYL ETHERS UNDER THE INFLUENCE OF MIXED METAL BASES
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Lithium diisopropylamide in the presence of catalytic amounts of potassium tert-butoxide smoothly converts homoallyl or homobenzyl type ethers to dienes (e.g., 1, 3, 5, 26) or styrenes (2). γ,δ-Unsaturated acetals give 1,3-dienyl ethers (e.g., 4) and 4-alkylidenetetrahydropyrans or dihydropyrans produce a variety of dienols (e.g., 6 - 17, 20 - 22). - If there is a choice, the new double bond is formed with high trans-selectivity while the configuration of existing double bonds is retained. - The elimination mode is syn-periplanar and concerted, though E1cb like.
- Margot, Christian,Rizzolio, Michele,Schlosser, Manfred
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p. 2411 - 2424
(2007/10/02)
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- REACTIONS ON A SURFACE. 1. CONDENSATION OF 3-METHYL-3-BUTEN-1-OL WITH CARBONYL COMPOUNDS ON SiO2 AND Al2O3
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3-Methyl-3-buten-1-ol reacts with various aldehydes and ketones on silica gel and Al2O3 surfaces in the absence of solvents and conventional catalysts for this reaction to form derivatives of di- and tetrahydropyrans.
- Ibatullin, U. G.,Pavlov, Yu. V.,Safarov, M. G.
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p. 1107 - 1109
(2007/10/02)
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