- The use of a diammonium salt in the synthesis of organic carbonates from epoxides and CO2: promoting effect of support
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Onium salt, N1, N1, N1, N5, N5, N5-hexaethylpentane-1,5-diammonium dibromide, was used as a catalyst for the addition of CO2 to epoxides. An influence of insoluble supports on the rate of the process as well as possibility of recycling of the catalytic system are described. In addition, the effects of temperature and CO2 pressure on the yields of products are discussed.
- Arzumanyan, A. V.,Chowdhury, B.,Davankov, V. A.,Lyubimov, S. E.,Muzafarov, A. M.,Zvinchuk, A. A.
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Read Online
- Binuclear pyridine acid ionic liquid, and preparation method and application thereof
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The invention discloses a binuclear pyridine acid ionic liquid, and a preparation method and application thereof. The chemical formula of the ionic liquid is Cn [N222] 2 [Py] 2, triethylamine, dibromo alkane and 3, 6-clopyralid are used as raw materials, the binuclear pyridine acid weeding ionic liquid is obtained through an alkanization reaction, a double decomposition reaction and a neutralization reaction, and the prepared binuclear pyridine acid ionic liquid has the characteristics of being medium in water solubility, not prone to volatilization and migration, high in biological activity and the like, and when acting on herbicides in pesticide chemistry, the binuclear pyridine acid ionic liquid has efficient herbicide physicochemical properties, high herbicidal activity and low crop toxicity.
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Paragraph 0042; 0044-0046
(2021/08/21)
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- Dinuclear quaternary ammonium salt ionic liquid compound as well as preparation method and application thereof
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The present invention discloses a double-core quaternary ammonium salt ionic liquid compound having two quaternary ammonium root cations and selected from the group consisting of formate. The acetate, propionate, butyrate, acetate radical anion. The invention further discloses a preparation method and of the ionic liquid, H and thereof. 2 The application of S absorption removal. The ionic liquid is novel in structure, convenient to synthesize and capable of effectively avoiding the defects of large pollution, strong corrosion, high energy consumption and the like of a traditional organic amine process. In addition, the ionic liquid H according to the present invention is used with respect to a normal ionic liquid. 2 S Absorbs capacity higher, and the effect is showing.
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Paragraph 0054-0055
(2021/09/01)
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- Imine macrocycle with a deep cavity: Guest-selected formation of syn/anti configuration and guest-controlled reconfiguration
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A dynamic covalent bond is one of the ideal linkages for the construction of large and robust organic architectures. In the present article, we show how organic templates can efficiently transform a complex dynamic imine library into a dynamic imine macrocycle. Not only is the constitution well controlled, but also the syn/anti host configuration is efficiently selected and even the orientation of the guest in the asymmetric cavity of the host can be well aligned. This is attributed to the delicate balance and the cooperation of multiple noncovalent interactions between the hosts and the guests. Through sequential additions of three guests in appropriate amounts, controlled structural reconfiguration of dynamic covalent architectures has been achieved for the first time.
- He, Zhenfeng,Ye, Gang,Jiang, Wei
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supporting information
p. 3005 - 3012
(2015/02/05)
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- Designing the synthesis of catalytically active Ti-β by using various new templates in the presence of fluoride anion
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Crystallization of large-pore Ti-β by using a variety of diquaternary ammonium derivatives of dibromoalkane and amines such as triethylamine, 1,4-diazabicyclo[2,2,2]octane (DABCO), and quinuclidine as structure-directing agents (SDA) is described. The size of hydrophobic bridging alkyl-chain length of the template [R3N+-(CH2)x-N +R3](OH-)2 directs the final crystalline product: Ti-β, Ti-ZSM-12, Ti-nonasil or Ti-ZSM-5, as x gradually changes from 6 to 1, in the fluoride medium under hydrothermal conditions. A dense phase such as Ti-nonasil (clathrasil type) is crystallized as the size of hydrophobic bridging alkyl-chain length decreases. The use of F- anions as a mineralizer and Ti4+ as a heteroatom in the synthesis gel also influences the selectivity of final crystalline product. The phase purity and incorporation of Ti4+ into the lattice of β (BEA) and ZSM-12 frameworks are confirmed using XRD, UV-visible, FT-IR, 29Si NMR spectroscopes, elemental analysis (ICP), surface area measurements and catalytic test reactions. The morphology of Ti-β samples is dependent on the nature of the structure-directing agent as revealed by the scanning electron microscopic (SEM) observations. The catalytic activity in the epoxidation of 4-vinyl-1-cyclohexene is increased with the amount of tetrahedral Ti4+ atoms in the framework. The new templates can be effectively used for preparation of catalytically active Ti-β with the minimum number of framework defect sites.
- Sasidharan, Manickam,Bhaumik, Asim
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experimental part
p. 16282 - 16294
(2012/01/14)
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- Process for manufacturing molecular sieve of MFS framework type and its use
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A method of making a crystalline molecular sieve of MFS framework type, said method comprising the steps of (a) adding at least one source of ions of tetravalent element (Y), at least one source of ions of trivalent element (X), at least one hydroxide source (OH?), at least one structure-directing-agent (R), at least one seed source (Seed), and water (H2O) to form a mixture having the following mole composition (expressed in term of oxide): [in-line-formulae]YO2:(n)X2O3:(x)OH?:(y)R:(z)H2O+(m)Seed[/in-line-formulae] wherein the m is in the range of from about 10 wtppm to about 2 wt. % (based on total weight of the synthesis mixture), the n is in the range of from about 0.005 to 0.05, the x is in the range of from about 0.01 to about 0.3, the y is in the range of from about 0.03 to about 2; and the z is in the range of from about 3 to about 30; and (b) treating said mixture under crystallization conditions to form said crystalline molecular sieve substantially free of non-MFS material, wherein said crystallization conditions comprise a temperature in the range of from about 150° C. to about 250° C., and crystallization time less than 100 hr, the weight hourly throughput is at least 0.001 hr?1.
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Page/Page column 6
(2008/06/13)
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- Ion channel topography of the neuronal nicotinic acetylcholine receptor: Pharmacochemical approaches
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Forty-three bisammonium ganglionic blockers were synthesized to study the structure of the ion channel of nicotinic acetylcholine receptor. The conformational parameters of these blockers were studied, and their effects toward the ganglionic transmission in situ on the sympathetic feline superior cervical ganglia and in vitro on the parasympathetic guinea-pig small intestine ganglia were determined. A model of the binding site for the bisammonium ganglionic blockers in the neuronal ion channel was proposed.
- Gmiro,Brovtsyna,Serdyuk,Lukomskaya
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p. 116 - 127
(2007/10/03)
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- The Quarternisation of Tertiary Amines with Dihalomethane
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Whereas dichloromethane is inert towards reaction with most tertiary amines under atmospheric conditions, it readily reacts with a wide variety at high pressures to produce α-chloro quaternary ammonium and even bis-ammonium salts.The reaction of dichloromethane and dibromomethane with eleven tertiary amines and properties of the products are described.
- Almarzoqi, B.,George, A. V.,Isaacs, N. S.
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p. 601 - 608
(2007/10/02)
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