- Novel direct amination of glycerol over heteropolyacid-based catalysts
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The direct amination of glycerol with dimethylamine (DMA) was studied over catalysts based on salts of phosphomolybdic acid. The highest yield of (dimethylamino)acetone (33%) was observed over a catalyst containing 50 wt% of Cs2.5H0.5PMo12O40 supported on a mesoporous silica. The corresponding sample showed good dispersion of the active phase leading to an increased number of available acid sites. With respect to the observed products, a reaction scheme was established explaining notably that the formation of 1,3-bis-dimethylamine-2-propanol and (dimethylamino)propanol was not possible due to the blocking of the required strong acid sites by DMA under reaction conditions.
- Safariamin,Paul,Moonen,Ulrichts,Dumeignil,Katryniok
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- Catalytic amination of glycerol with dimethylamine over different type ofheteropolyacid/Zr-MCM-41 catalysts
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The effect of different type of heteropolyacid/Zr-MCM-41 catalysts on the catalytic amination of glycerol with dimethylamine to produce Dimethylamino-3-propanal was researched. Under the premise of their respective optimum loading amount, the specific sur
- Ding, Jianfei,Cui, Mingyu,Ma, Tianlin,Shao, Rong,Xu, Wei,Wang, Pengfei
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- Low-Temperature Reductive Aminolysis of Carbohydrates to Diamines and Aminoalcohols by Heterogeneous Catalysis
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Short amines, such as ethanolamines and ethylenediamines, are important compounds in today's bulk and fine chemicals industry. Unfortunately, current industrial manufacture of these chemicals relies on fossil resources and requires rigorous safety measures when handling explosive or toxic intermediates. Inspired by the elegant working mechanism of aldolase enzymes, a novel heterogeneously catalyzed process—reductive aminolysis—was developed for the efficient production of short amines from carbohydrates at low temperature. High-value bio-based amines containing a bio-derived C2 carbon backbone were synthesized in one step with yields up to 87 C%, in the absence of a solvent and at a temperature below 405 K. A wide variety of available primary and secondary alkyl- and alkanolamines can be reacted with the carbohydrate to form the corresponding C2-diamine. The presented reductive aminolysis is therefore a promising strategy for sustainable synthesis of short, acyclic, bio-based amines.
- Pelckmans, Michiel,Vermandel, Walter,Van Waes, Frederik,Moonen, Kristof,Sels, Bert F.
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p. 14540 - 14544
(2017/10/23)
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- Preparation method of N-acetonyl amine compound
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The invention discloses a preparation method of an N-acetonyl amine compound. The method comprises the following steps that an amine compound and glycerin are used as reaction raw materials, and in the presence of a composite catalyst and an alkali addition agent, in reaction mediums and at the reaction temperature of 80-180 DEG C, a reaction is performed for 2-48 hours in a sealed reactor so that the N-acetonyl amine compound is obtained. The method disclosed by the invention is simple, reaction conditions are mild, target products can be obtained at a low cost and at a high yield, and the used catalyst has high catalytic activity and is easy to separate and repeatedly use in a reaction system; besides, the whole process is environment-friendly, and the utilization of by-products namely the glycerin of biologic diesel oil is promoted.
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Paragraph 0046
(2016/10/09)
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- Method for preparing chiral diphosphines
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The invention concerns a method for preparing a compound of formula (1) wherein: A represents naphthyl or phenyl optionally substituted; and Ar1, Ar2independently represent a saturated or aromatic carbocyclic group, optionally substituted.
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- Contrast media synthesized from polyaldehydes
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Microparticles comprising biodegradable polymers, characterized in that they are synthesized from polymerizable aldehydes, which optionally contain additives and/or crosslinkers capable of copolymerization, optionally surfactants or surfactant mixtures, gases and/or highly volatile liquids in free or bound form, coupling agents, optionally biomolecules or macromolecules bound by these coupling agents as well as optionally diagnostically or therapeutically effective components, are suitable as ultrasonic contrast media.
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- INVESTIGATIONS IN THE REGION OF AMINE AND AMMONIUM COMPOUNDS CXCIX. COMPETITION BETWEEN 1,4-ELIMINATION AND STEVENS 3,2-REARRANGEMENT IN THE REACTION OF AMMONIUM SALTS CONTAINING N-PHENACYL OR N-ACETONYL GROUP WITH ALCOHOL SOLUTION OF ALKALI
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The reactions of ammonium salts containing an N,N-dimethyl-N-phenacyl or N-acetonyl-N,N-dimethyl group in addition to a 4-substituted 2-alkenylene group with an alcohol solution of alkali were studied.It was shown that 1,4-elimination occurs in the case of salts containing the N,N-dimethyl-N-phenacyl group with a bromine atom at position 4, while a Stevens 3,2-rearrangement takes place if the bromine is substituted by a tertiary or quaternary ammonium group under the same conditions.In the case of salts containing the N-acetonyl-N,N-dimethyl group the Stevens rearrangement only takes place in the presence of the N-methyl-N-phenylamino group at position 4; in other cases 1,4-elimination, leading 1,3-dienylammonium salts occurs.
- Saakyan, T. A.,Gyul'nazaryan, A. Kh.,Churkina, N. P.,Babayan, A. T.
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p. 1898 - 1903
(2007/10/02)
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- Synthesis and Properties of Cyclic Keto Alkenylammonium Salts
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The cyclic keto alkenylammonium salts (4)-(8) have been prepared by a short, general route and their acidic and electrophilic properties examined.
- Jung, Michael E.,Love, Brian E.
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p. 1288 - 1290
(2007/10/02)
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