- Acetals and Ethers. 11. Solubility of Alkyl-Substituted 1,3-Dioxolanes and 1,3-Dioxanes in Water
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2-Alkyl-1,3-dioxolanes, 2-alkyl-4-methyl-1,3-dioxolanes, and 2-alkyl-1,3-dioxanes (alkyl: n-C3H7, ...,n-C6H13) were synthesized and their solubilities in E10-4 M aqueous sodium bicarbonate solution at 293.2 K determined.The standard free energies for transfer from aqueous solution to pure liquid phase, ΔGto, were calculated from the solubility data and the contributions of given fragments of molecules to the free energy estimated.The fve-membered 1,3-dioxolane and six-membered 1,3-dioxane rings given fragments of molecules to the free energy contribution ΔGto, related to the cyclic fragments of the molecules, are +2.84 +/- 0.20 and +2.26 +/- 0.36 kJ mol-1, respectively.Their hydrophilicity is, however, much weaker than hat of the hydroxy group in normal alcohols.The 1,3-dioxolane ring bearing a methyl group at the C-4 atom has a markedly weaker hydrophilic character.
- Sokolowski, Adam,Burczyk, Bogdan,Oles, Jan
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- preliminary aldehyde (C 2-C 10) propylene glycol acetal synthetic method (by machine translation)
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The invention discloses a synthetic method of low-grade aldehyde (C2-C10) propylene glycol acetal. A target object is prepared from low-grade aldehyde (C2-C10), 1, 2-propylene glycol, anhydrous calcium chloride and p-toluenesulfonic acid which are reacted in the method. By adopting the method disclosed by the invention, the reaction is free from byproducts and pollution, the product purity and the product recovery rate are high, the cost is low, the efficiency is high and the fragrance is good. Through simple stirring reaction, the content of the acetal can reach condensation over 98%, and the method is applicable to mixing various high-grade essences and has a considerable effect of increasing the stability and temperature resistance of an essence finished-product.
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Paragraph 0017; 0018
(2016/10/07)
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- Synthesis of Aldehydes by Ozonolysis of Secondary Allyl
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The invention relates to a process for the preparation of an aldehyde from a secondary alcohol having a double bond in the alpha position, comprising the steps. a) provision of the alcohol,b) treatment of the alcohol with ozone.
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Page/Page column 4
(2009/01/24)
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