- Method for preparing 2, 2, 4-trimethyl-1, 3-pentanediol double isobutyric acid ester
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The invention discloses a method for preparing 2, 2, 4-trimethyl-1, 3-pentanediol double isobutyric acid ester. The method includes the steps that 1, an alkali metal hydroxide, a phase transfer catalyst and water are mixed in a certain proportion, and isobutyraldehyde is dropwise added slowly; the temperature is raised to 30-50 DEG C after the isobutyraldehyde is dropwise added completely, and heat preservation is conducted for 1-5 hours; 2, the temperature is lowered to room temperature, a water phase is removed, the alkali metal hydroxide is added to an organic phase in a certain proportion, the temperature is raised to 60-70 DEG C, and a heat preservation reaction is conducted for 6-12 hours; 3, the temperature is lowered to the room temperature, the alkali metal hydroxide is removed, and the remaining organic phase is reserved; 4, a certain quantity of isobutyric acid, a solid sulfate catalyst and a water-carrying agent are added to the remaining organic phase, the mixture is heated to 120-150 DEG C, and a heat preservation reaction is conducted for 2-5 hours; after the reaction is completed, filtering is conducted to remove the solid sulfate catalyst, water washing is conducted to remove isobutyric acid which does not participate in the reaction, the water-carrying agent is removed through rotary evaporation, reduced pressure distillation is conducted, and a target product is obtained. Compared with the prior art, by means of the preparation method, the target product is high in yield, the operation process is simple and safe, and industrialized production is achieved easily.
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Paragraph 0025; 0026; 0027
(2016/11/28)
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- COMPOUNDS FOR THE CONTROLLED RELEASE OF ACTIVE ALDEHYDES
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The present invention relates to the field of perfumery. More particularly, it concerns an aldoxane derivative of Formula (I) capable of protecting an active aldehyde R1CHO, for example a perfumery or flavor aldehyde, from a chemically aggressive medium into which they have to be added, and then of releasing said active aldehyde at the desired moment. The present invention concerns also the use of said compound in perfumery or in the flavor industry as well as the compositions or articles associated with said aldoxanes.
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Page/Page column 15-16
(2008/06/13)
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- Diphenylboron perchlorate as an efficient catalyst for self- and cross-condensation reactions of aldehydes having α-active hydrogens
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Diphenylboron perchlorate very smoothly catalyzed self- and cross-condensation reactions of aldehydes at rt in nitroethane. The new catalyst provided novel behaviors owing to the characteristics of possessing a covalency in the boron-oxygen bond, compared with ionic perchlorates.
- Kiyooka, Syun-Ichi,Fujimoto, Hiroshi,Mishima, Masaaki,Kobayashi, Shinjiro,Uddin, Khabir Md.,Fujio, Mizue
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p. 927 - 930
(2007/10/03)
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