- Method for preparing triacetone amine
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An improved method is used for preparing triacetone amine while recycling the by-products. This involves treating the crude product from triacetone amine preparation, which leads to an increase in the content of compounds which react readily with ammonia. This method enables efficient recycling of the by-products formed in the synthesis of triacetone amine.
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Paragraph 0133-0144
(2020/07/05)
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- Effect of Alkali Treatment of HY Zeolite on Continuous Synthesis of Triacetonamine
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The continuous synthesis of triacetonamine from acetone and ammonia over HY was realized. Meanwhile, alkali-treated HY with different structure and acidities were prepared and examined. The results indicated that the acid sites, especially Br?nsted acid sites, played a vital role on the selectivity of triacetonamine and the conversion of acetone. It was further confirmed by X-ray diffraction (XRD), N2 adsorption and desorption experiments, IR spectra of adsorbed pyridine, and NH3 temperature-programmed desorption. Meanwhile, the generation mechanisms of triacetonamine and impurities were speculated.
- Tian, Jun,Chen, Ligong,Zhang, Chao,Yan, Xilong,Li, Yang
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p. 1377 - 1381
(2015/02/19)
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- Continuous synthesis of triacetonamine over sulfonic acid-functionalized mesoporous silicas
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The continuous synthesis of triacetonamine from acetone and ammonia was realized over sulfonic acid-functionalized mesoporous silicas. These catalysts were characterized by TG, XPS, BET, elemental analysis and acid-base titration. The results indicated th
- Tian, Jun,Chen, Ligong,Zhang, Chao,Yan, Xilong,Li, Yang
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p. 17860 - 17865
(2014/05/06)
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- The mechanism of catalyst deactivation and by-product formation in acetone ammoximation catalyzed by hollow titanium silicalite
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The deactivation mechanism of hollow titanium silicalite (HTS) in aqueous ammoximation of acetone was investigated. Amines and polynitro-compounds, formed by alkaline autocatalytic and oxidative coupling reaction respectively, were determined to be the ma
- Wang, Yi,Zhang, Shengjian,Zhao, Yingxian,Lin, Min
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- Methods and compositions for treating amyloid-related diseases
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Methods, compounds, pharmaceutical compositions and kits are described for treating or preventing amyloid-related disease.
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Page/Page column 154
(2010/11/24)
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- NEW SYNTHETIC "TRICKS". (Et3NH)(Sn(SPh)3) AND Bu2SnH2, TWO USEFUL REAGENTS FOR THE REDUCTION OF AZIDES TO AMINES
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Treatment of Sn(SPh)2 with PhSH and Et3N affords a tin(II) complex, soluble in organic solvents, wich is the best reducing agent for azides reported so far.Bu2SnH2, although not so reactive, also shows several advantages with regard to the standard reducing agents for azides, such as its solubility in most solvents or its scarce reactivity with water.
- Bartra, Marti,Urpi, Felix,Vilarrasa, Jaume
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p. 5941 - 5944
(2007/10/02)
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- Synthesis of Hexahydro-3,3,5,5,7-pentaalkyl-2H-1,4-diazepin-2-ones from 1,3-Diamines and Ketones
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A new method for preparing mono- and bis(hexahydro-3,3,5,5,7-pentaalkyl-2H-1,4-diazepin-2-ones) is reported (Schemes I and II).The key step of this synthesis is the final one in which a 1,3-diamine is reacted with a ketone in the presence of sodium hydroxide, chloroform, and a phase-transfer catalyst (PTC).Bis(hexahydro-3,3,5,5,7-pentaalkyl-2H-1,4-diazepin-2-ones) are isolated as a mixture of diastereomers.Of these bis compounds, diastereomers of 1,1'-(1,2-ethanediyl)bis(hexahydro-3,3,5,5,7-pentamethyl-2H-1,4-diazepin-2-one) (5a) can be readily separated by a fractional recrystallization, or their diastereomeric distributions can be measured by 13C NMR.
- Son, Pyong-nae,Lai, John T.
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p. 323 - 327
(2007/10/02)
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- RADICAL STABILIZING EFFECTS. A COMPARISON OF TRANSITION STATE EFFECTS (RATES OF AZOALKANE DECOMPOSITIONS) WITH CALCULATED (AB INITIO) PI SPIN DENSITIES
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Rate studies on five azoalkanes (4a-e) have been studied to assess important radical stabilizing effects.MO calculations of spin densities for three radicals with pi systems are correlated with kinetic rates of radical formation.
- Dube, Michael F.,Timberlake, Jack W.
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p. 1753 - 1756
(2007/10/02)
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