- Regioselective synthesis of 1,5-Diaryl-2-(Hydroxyalkyl)-8-Methylglycolurils
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The cyclocondensation of N-methylurea with derivatives of tetrahydroimidazooxazolone, tetrahydro-imidazooxazinone, dihydroimidazooxazinone, and tetrahydroimidazooxazepinone was studied for the first time. It was shown that the reactions take place with high regioselectivity, are regular in character, and lead to the formation of previously inaccessible 1,5-diaryl-2-(hydroxyalkyl)-8-methylglycolurils with high yields.
- Antonova,Baranov,Nelyubina,Kravchenko
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- New integrated-action oilfield reagent having properties of scaling inhibitor and hydrogen sulfide neutralizer
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Method for obtaining a new oilfield reagent for inhibition of scaling and neutralization of hydrogen sulfide on the basis of paraformaldehyde, monoethanolamine, and phosphorus(V) oxide was developed.
- Ishmiyarov,Rakhimova,Latypova,Abdullin,Voloshin,Dokichev
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- HEXAHYDROTRIAZINES, SYNTHESIS AND USE
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Methods for making asymmetrical triazines are provided. The methods comprise first forming a mixture of at least two primary amines then reacting the mixture with an aldehyde. Methods for removing sulfides from hydrocarbon streams are also provided. The triazines may be added to the hydrocarbon stream in a molar ratio of triazine:H2S of about 10:1 to about 1:2 wherein R1, R2, and R3 are chosen from alkyls, hydroxyl-substituted alkyls, and alkoxy-substituted alkyl of 1 to 10 carbon atoms, with the proviso that R1, R2, and R3 are not all the same.
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Paragraph 0021
(2013/05/23)
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- Synthesis of new bis-imidazole derivatives
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The reaction of aldimines with α-(hydroxyimino) ketones of type 10 (1,2-diketone monooximes) was used to prepare 2-unsubstituted imidazole 3-oxides 11 bearing an alkanol chain at N(1) (Scheme 2, Table 1). These products were transformed into the corresponding 2H-imidazol-2-ones 13 and 2H-imidazole-2-thiones 14 by treatment with Ac2O and 2,2,4,4-tetramethylcyclobutane-l,3-dithione, respectively (Scheme 3). The three-component reaction of 10, formaldehyde, and an alkane-1,ω-diamine 15 gave the bis[1H-imidazole 3-oxides] 16 (Scheme 4, Table2). With Ac 2O, 2,2,4,4-tetramethylcyclobutane-1,3-dithione or Raney-Ni, the latter reacted to give the corresponding bis[2H-imidazol-2-ones] 19 and 20, bis[2H-imidazol-2-thione] 21, and bis[imidazole] 22, respectively (Schemes 5 and 6). The structures of 11a and 16b were established by X-ray crystallography.
- Jasinski, Marcin,Mloston, Grzegorz,Mucha, Paulina,Linden, Anthony,Heimgartner, Heinz
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p. 1765 - 1780
(2008/02/13)
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- 2-(1,3,5-Dithiazinan-5-yl)ethanol heterocycles, structure and reactivity
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Treatment of 2-(1,3,5-dithiazinan-5-yl)ethanol (1), 2-(1,3,5-dithiazinan-5- yl)-1-phenylethanol (2), 2-(1,3,5-dithiazinan-5-yl)-1-methylethanol (3) and 2-(1,3,5-dithiazinan-5-yl)-2-methyl-1-phenylethanol (4) with TsCl and NEt 3 in CH2Cl2 afforded the corresponding 3-tosyl-1,3-oxazolidine derivatives (5-8), whereas tosylation of 1-4 in the presence of NHMe3Cl gave the corresponding O-tosyl-2-(1,3,5- dithiazinan-5-yl)ethanol derivatives (11-14). The direct preparation of 5 and 7 from formaldehyde and N-tosylethanolamine (9) or N-tosyl-2-propanolamine was not successful. Reactions of 1 or 3 with benzylamine furnish 1,3,5-tribenzyl-1,3,5- triazinane. Heating of 1 and 2 affords the corresponding 1,3,5-tri(2- hydroxyethyl)-1,3,5-triazinanes. X-Ray diffraction studies of compounds (1-9 and 11) are reported.
- Gálvez-Ruiz, Juan Carlos,Jaen-Gaspar, Javier C.,Castellanos-Arzola, Indira G.,Contreras, Rosalinda,Flores-Parra, Angelina
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p. 2269 - 2285
(2007/10/03)
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- Chromium complexes of hydroxyl-functionalised 1,3,5-triazacyclohexanes
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The chromium co-ordination chemistry of three 1,3,5-triazacyclohexanes bearing hydroxyl-functionalised substituents on nitrogen has been explored. The complexes [CrL3(C3H6N3R3)] (L = CO, R = CH2CH2OH, CH2CH2CH2OH or o-hydroxybenzyl; L = Br, R = CH2CH2CH2OH) have been prepared. Characterisation of the carbonyl complexes by spectroscopic and structural methods indicated that the triazacyclohexanes co-ordinate to the chromium centre through the three nitrogen atoms only. Crystal structure determinations for 1,3,5-tri(o-hydroxybenzyl)-1,3,5-triazacyclohexane and [Cr(CO)3(C3H6N3R3)] (R = CH2CH2OH or CH2CH2CH2OH) have been made.
- Baker, Murray V.,Brown, David H.,Skelton, Brian W.,White, Allan H.
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p. 1483 - 1490
(2007/10/03)
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- Methods for regenerating a sulfur scavenging compound from a product of a sulfur scavenging reaction
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Methods are provided whereby an N-C-N compound is regenerated from a product of a sulfur scavenging reaction, in which said N-C-N compound removes a sulfur atom from a sulfur compound, to form the original N-C-N compound. The N-C-N compound is represented by the formula (I): STR1 The product includes a hetero compound having sulfur, carbon and nitrogen atoms in its backbone. In one embodiment, the product is mixed with (1) a nitrogen compound represented by the formula (II): STR2 and (2) an alkaline compound selected from alkali metal, alkaline earth metal and transition metal compounds, to form a solution, slurry or dispersion. The hetero compound is reacted with the nitrogen compound in the presence of the alkaline compound, such that a sulfur atom of the hetero compound is replaced by a nitrogen atom of the nitrogen compound. If necessary, the pH of the solution may be adjusted to about 8 to about 13 to facilitate the reaction. In alternative embodiments, the product also includes an amine complex. The nitrogen atom being substituted for the sulfur atom in the hetero compound may be obtained from either the nitrogen compound or the amine complex.
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