Synthesis of first representatives of 3,3′-bi(6,8-dialkyl-2,4-dioxa-6,8-diazabicyclo[3.3.0]octan-7-ones)
作者:Andrey S. Sigachev、Angelina N. Kravchenko、Galina A. Gazieva、Pavel A. Belyakov、Natal'Ya G. Kolotyrkina、Oleg V. Lebedev、Nina N. Makhova、Konstantin A. Lyssenko
DOI:10.1002/jhet.5570430523
日期:2006.9
The firstrepresentatives of 3,3′-bi(2,4-dioxa-6,8-diazabicyclo[3.3.0]octan-7-ones) have been synthesized by a reaction of glyoxal as form of 2,2′-bi(4,5-dihydroxy-1,3-dioxalane) with N,N′-dialkylureas. Their structures have been supported by X-ray analysis. 1,3-Dialkylimidazolidine-2,4-diones (hydantoins) have been isolated as by-products and their formation mechanism has been experimentally confirmed
Synthesis of new chiral mono-, di-, tri-, and tetraalkylglycolurils
作者:A. N. Kravchenko、A. S. Sigachev、E. Yu. Maksareva、G. A. Gazieva、N. S. Trunova、B. V. Lozhkin、T. S. Pivina、M. M. Il’in、K. A. Lyssenko、Yu. V. Nelyubina、V. A. Davankov、O. V. Lebedev、N. N. Makhova、V. A. Tartakovsky
DOI:10.1007/s11172-005-0307-3
日期:2005.3
Two general procedures were developed for the synthesis of chiral N-mono-, N, N′-di-, N, N′ N″-tri-, and N, N′, N″, N′″-tetraalkylglycolurils based on the reactions of 4,5-dihydroxy-imidazolidin-2-ones or glyoxal with one or two moles of alkylureas, respectively, by acid catalysis. The reactions of N-monoalkyl- and N, N′-dialkylureas with glyoxal proceed regioselectively. The mechanism of these reactions was suggested and partly confirmed by quantum-chemical calculations and experimental data. The enantiomeric separation of some chiral glycolurils by chiral-phase HPLC was carried out for the first time.
在 4,5-二羟基咪唑烷-2-酮或乙二醛分别与一或两摩尔烷基脲在酸催化下发生反应的基础上,开发了合成手性 N-单烷基、N, N′-二烷基、N, N′-三烷基和 N, N′,N″,N′″-四烷基乙二醛的两种一般程序。N-单烷基和 N,N′-二烷基脲与乙二醛的反应具有区域选择性。量子化学计算和实验数据提出并部分证实了这些反应的机理。首次利用手性相高效液相色谱法分离了一些手性羟基乙醛的对映体。
Functionalized aldehydes as H2S and mercaptan scavengers
申请人:Baker Hughes, a GE company, LLC
公开号:US10513662B2
公开(公告)日:2019-12-24
Certain functionalized aldehydes scavengers may be used to at least partially scavenge sulfur-containing contaminants from fluid systems containing hydrocarbons and/or water. The contaminants scavenged or otherwise removed include, but are not necessarily limited to, H2S, mercaptans, and/or sulfides. Suitable scavengers include, but are not necessarily limited to, reaction products of glycolaldehyde with aldehydes; reaction products of glycolaldehyde with a nitrogen-containing reactant (e.g. an amine, a triazine, an imine, an aminal, and/or polyamines); non-nitrogen-containing reaction products of a hydrated aldehyde with certain second aldehydes; reaction products of 1,3,5-trioxane with hydroxyl-rich compounds (e.g. glyoxal, polyethylene glycol, polypropylene glycol, pentaerythritol, and/or sugars); and reaction products of certain aldehydes with certain phenols; and combinations of these reaction products.