- Tris(2-hydroxyethyl)ammonium salts: 2,8,9-Trihydroprotatranes
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New method of synthesis of tris(2-hydroxyethyl)ammonium salts, 2,8,9-trihydroprotatranes X-[HN(CH2CH2OH) 3]+, based on the reaction of tris(2-hydroxyethyl)amine (triethanolamine) with ammonium salts NH4X (X = F, Cl, Br, I, NO 3, ClO4) was developed. 1H, 13C, 15N NMR and IR spectra of these protatranes were investigated, as well as those of their analogs with X = RCH2COO (R = H; 2-MeC 6H4O; 2-Me-4ClC6H3O; 2-MeC 6H4S; 4-ClC6H4S; 4-ClC 6H4SO2; 3-IndS; 3-(PhCH2-IndS) prepared from the corresponding acids RCH2COOH and triethanolamine. The parameters of IR and NMR spectra of the studied protatranes were governed by the nature of substituent X, which also determined the character of the intra and intermolecular hydrogen bonds NH...O and OH...O in the protatrane framework.
- Voronkov,Albanov,Aksamentova,Adamovich,Chipanina,Mirskov,Kochina,Vrazhnov,Litvinov
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experimental part
p. 2339 - 2346
(2010/05/15)
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- PROCESS FOR THE PREPARATION OF ALKYLENE CARBONATE
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A process for the preparation of an alkylene carbonate, said process comprising contacting the corresponding alkylene oxide with carbon dioxide in the presence of water and in the presence of a catalytic composition comprising an organic base neutralised with a hydrogen halide, wherein the organic base comprises a carbon-based compound comprising one or more nitrogen atoms with at least one free electron pair and/or one or more phosphorous atoms with at least one free electron pair and wherein the organic base has a pKa greater than 8.
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Page/Page column 5
(2008/06/13)
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- S-(trimethoxysilylmethyl)- and S-(silatranylmethyl)isothiuronium halides and their N-substituted derivatives
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Previously unknown S-(trimethoxysilylmethyl)- and S-(silatranylmethyl) isothiuronium halides and their N-substituted derivatives were prepared. According to the IR and UV spectra, these compounds exist in the solid state and in methanol and acetonitrile solutions in the form of two equilibrium salt structures: those with the positively charged nitrogen and carbon atoms, or predominantly in one of these. In solutions of the iodides in highly polar acetonitrile, the first salt structure can occur in an equilibrium with its dissociation products, S-organylisothiourea (or its N-substituted derivative) and hydrogen iodide.
- Sorokin,Lopyrev,Chipanina,Sherstyannikova,Voronkov
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p. 551 - 558
(2007/10/03)
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