- TRIETHOXY(3-ISOTHIOCYANATOPROPYL)SILANE
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The reaction of triethoxy(3-aminopropyl)silane with carbon disulfide and ortho-chloroethyl formate in absolute ethanol gave triethoxy(3-isothiocyanatopropyl)silane for the first time.The presence of SCN and (C2H5O)3Si groups in this compound enabled us to use it for the preparation of adsorbents and polymer coatings with biocidal activity. Keywords: triethoxy(3-isothiocyanatopropyl)silane, triethoxy(3-aminopropyl)silane, carbon disulfide, orthochloroethyl formate.
- Voronkov, M. G.,Stankevich, O. S.,Dubinskaya, E. I.
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- Synthesis, characterization and catalytic performance in enantioselective reactions by mesoporous silica materials functionalized with chiral thiourea-amine ligand
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Chiral heterogeneous catalysts have been synthesized by grafting of silyl derivatives of (1R, 2R)- or (1S, 2S)-1,2-diphenylethane-1,2-diamine on SBA-15 mesoporous support. The mesoporous material SBA-15 and so-prepared chiral heterogeneous catalysts were characterized by a combination of different techniques such as X-ray diffractometry (XRD), Fourier transform infrared (FT-IR), thermogravimetric analysis (TGA), field emission scanning electron microscopy (FESEM), and Brunauer–Emmett–Teller (BET) surface area. Results showed that (1R, 2R)- and (1S, 2S)-1,2-diphenylethane-1,2-diamine were successively immobilized on SBA-15 mesoporous support. Chiral heterogeneous catalysts and their homogenous counterparts were tested in enantioselective transfer hydrogenation of aromatic ketones and enantioselective Michael addition of acetylacetone to β-nitroolefin derivatives. The catalysts demonstrated notably high catalytic conversions (up to 99%) with moderate enantiomeric excess (up to 30% ee) for the heterogeneous enantioselective transfer hydrogenation. The catalytic performances for enantioselective Michael reaction showed excellent activities (up to 99%) with poor enantioselectivities. Particularly, the chiral heterogeneous catalysts could be readily recycled for Michael reaction and reused in three consecutive catalytic experiments with no loss of catalytic efficacies.
- G?k, Ya?ar,G?k, Halil Zeki
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p. 853 - 874
(2020/11/10)
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- Water soluble homogeneous catalysts that are recoverable by phase selectivity and host-guest interactions
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A chemical reaction is catalyzed in an organic solvent using a water soluble N-heterocyclic carbene homogeneous catalyst to form a reaction mixture. An aqueous phase in the reaction mixture. A solvent in which the catalyst is insoluble is added to the reaction mixture, causing the catalyst to migrate to the aqueous phase to form a catalyst-laden aqueous phase. The catalyst is extracted from the catalyst-laden aqueous phase.
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Page/Page column 9; 10
(2020/08/30)
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- Removable Water-Soluble Olefin Metathesis Catalyst via Host-Guest Interaction
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A highly removable N-heterocyclic carbene ligand for a transition-metal catalyst in aqueous media via host-guest interactions has been developed. Water-soluble adamantyl tethered ethylene glycol in the ligand leads a hydrophobic inclusion into the cavity of β-cyclodextrin. Ruthenium (Ru) olefin metathesis catalyst with this ligand demonstrated excellent performance in various metathesis reactions in water as well as in CH2Cl2, and removal of residual Ru was performed via filtration utilizing a host-guest interaction and extraction.
- Kim, Cheoljae,Ondrusek, Brian A.,Chung, Hoyong
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supporting information
p. 736 - 739
(2018/02/09)
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- Acyl iodides in organic synthesis. Reactions of acetyl iodide with urea, thiourea, and their N,N′-disubstituted derivatives
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Acetyl iodide reacted with urea and its derivatives to give the corresponding N-substituted products. The reactions of acetyl iodide with thiourea, N,N′-dimethylthiourea, imidazolidine-2-thione, and hexahydropyrimidine-2-thione resulted in the formation o
- Voronkov,Vlasova,Grigor'Eva,Belousova,Vlasov
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experimental part
p. 486 - 490
(2009/08/17)
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- N,N'-Bis(3-trialkylsilylpropyl)- and N,N'-Bis(3-trialkoxysilylpropyl)thiocarbamides and Their Derivatives
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N,N'-Bis(3-trialkylsilylpropyl)- and N,N'-bis(3-trialkoxysilylpropyl)thiocarbamides were prepared by the reaction of (3-aminopropyl)trialkyl- and (3-aminopropyl)trialkoxysilanes with thiocarbamide and ammonium thiocyanate at 170-180 deg C at a 2:1 molar ratio. The products were converted to isothiouronium salts by treatment with 3-bromo-2-phenylindenone, with showed antithrombic effect. N,N'-Bis(3-triethoxysilylpropyl)thiocarbamide was subjected to hydrolytic polycondensation and used to modify silica gel to obtain PSTM-3 and PSTM-3G organosilicon sorbents. Modification with N,N'-bis(3-triethoxysilylpropyl)thiocarbamide endows varios materials (polymers, glass, ceramic, etc.) water-resisting, fungicidal, and some other useful properties. Cigarette filters impregnated with N,N'-bis(3-triethoxysilylpropyl)thiocarbamide remove carcinogens and toxicants from tobacco smoke.
- Voronkov, M. G.,Vlasova, N. N.,Pestunovich, A. E.
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p. 770 - 774
(2007/10/03)
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