- METHOD FOR THE PRODUCTION OF POLYOXYMETHYLENE DIALKYL ETHERS FROM TRIOXAN AND DIALKYLETHERS
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The invention relates to a method for production of polyoxymethylene dialkyl ethers of formula H2m+1CmO(CH2O)nCmH2m+1, where n = 2 - 10, m independently = 1 or 2, in which a dialkyl ether selected from dimethyl ether, methyl ethyl ether or diethyl ether and trioxan are fed into a reactor and reacted in the presence of an acid catalyst, whereby the amount of water introduced into the reaction mixture with the dialkyl ether, trioxan and/or the catalyst is 1 wt. %, with relation to the reaction mixture.
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Page/Page column 6
(2008/06/13)
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- METHOD FOR PRODUCING ALKYLENE GLYCOL DIETHERS
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The invention concerns a method for producing alkylene glycol diethers by reacting a linear or cyclic ether with an alkylene oxide in the presence of a Lewis acid. The invention is characterized in that the reaction is continuously carried out in a microreactor.
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Page/Page column 7-9
(2008/06/13)
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- Cleavage of different ether bonds in butyl glycidyl ether and allyl glycidyl ether by K-, K+ (15-crown-5)2
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The kind of substituent in alkyl glycidyl ethers affects the course of their reaction with K1, K+ (15-crown-5)2. The cyclic oxirane ring is exclusively cleaved in the case of butyl glycidyl ether whereas the presence of the unsaturated allyl group in the glycidyl ether molecule unexpectedly prefers the scission of the linear ether bond. In both the systems organometallic intermediates are formed. They react with crown ether causing its ring opening. Allylpotassium formed from allyl glycidyl ether reacts also with another glycidyl ether molecule; the oxirane ring is opened in this case.
- Grobelny, Zbigniew,Stolarzewicz, Andrzej,Maercker, Adalbert,Krompiec, Stanis?aw,Bieg, Tadeusz
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p. 133 - 138
(2007/10/03)
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- Preparation and decomposition of potassium alkalide-lipophilic crown ether complexes in tetrahydrofuran
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Cyclohexano-15-crown-5, cyclohexano-18-crown-6, dicyclohexano-15-crown-5, and dicyclohexano-18-crown-6, but not dicylohexano-16-crown-5, in THF dissolve potassium metal to form dark blue potassium alkalide solutions at ambient temperature. On standing, the potassium alkalide complexes decompose and the solutions turn colorless at differing rates. Identification of the products provides insight into the decomposition mechanism.
- Grobelny, Zbigniew,Stolarzewicz, Andrzej,Morejko-Buz, Barbara,Bartsch, Richard A.,Yamato, Kazuhiro,Fernandez, Fernando A.,Maercker, Adalbert
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p. 7807 - 7812
(2007/10/03)
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- SYNTHESIS OF DIALKYL ETHERS OF POLYETHYLENE GLYCOLS
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Methods were developed for synthesis of dimethyl and diethyl ethers of polyethylene glycols in one step (without isolation of intermediates) with the general formula R(OC2H4)mOR, where R=CH3, C2H5 and m=2-6 (degree of polyglycolicity).As starting materials monomethyl and monoethyl ethers of polyethylene glycols of the formula R(OC2H4)nOH were used, where n=1-3.As reagents toluenesulfonyl chloride and methanesulfonyl chloride were used.
- Barnakov, Ch. N.,Volgin, A. A.
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p. 152 - 155
(2007/10/02)
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- AFFINITIES OF CROWN ETHERS, GLYMES, AND POLYAMINES FOR ALKALI PICRATES IN TOLUENE. APPLICATION OF POLYMER-SUPPORTED LINEAR POLYETHERS.
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This work reports the measurements of K values for polyamines, glymes, a few glycols (including that of a long-chain polyethylene glycol, carbowax 6000), and some frequently used cation-binding ligands as complexers of lithium or sodium picrate in toluene as solvent. K values for different resins obtained with the same soluble ligand provide a comparison of the effectiveness of these resins in binding ionic solutes.
- Xu,Smid
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p. 3790 - 3796
(2007/10/02)
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