Results 321 to 330 of about 3,583,052 (388)
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2022
This chapter focuses on amines. Saturated amines are regarded as the simplest organonitrogen compound. The chapter highlights the importance of amines as they occur widely in nature and are used often as building blocks for more complex compounds and co-reagents in numerous organic reactions.
Patrick D. Bailey, Keith M. Morgan
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This chapter focuses on amines. Saturated amines are regarded as the simplest organonitrogen compound. The chapter highlights the importance of amines as they occur widely in nature and are used often as building blocks for more complex compounds and co-reagents in numerous organic reactions.
Patrick D. Bailey, Keith M. Morgan
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Unsaturated bisquaternary ammonium compounds [PDF]
Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1970 1. We obtained a number of unsaturated bisquaternary ammonium compounds. 2. The preparations produced are of pharmacological interest, having curare activity.
R. Kh. Freidlina, T. A. Kost
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Molecular recognition of organic ammonium ions in solution using synthetic receptors
Beilstein Journal of Organic Chemistry, 2010 Ammonium ions are ubiquitous in chemistry and molecular biology. Considerable efforts have been undertaken to develop synthetic receptors for their selective molecular recognition.
Burkhard König, José Antonio Alonso
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Inclusion of Quaternary Ammonium Compounds by Calixarenes
Journal of Inclusion Phenomena and Molecular Recognition in Chemistry, 1994In weakly polar solvents, strong association occurs between calixarene anions and tetraalkylammonium cations, with the magnitude of the observed equilibrium constants depending upon the charge on the anion, the solvent, the ring size of the calixarene and the nature of the alkyl group of the cation. Large upfield shifts of the methyl resonances of the [
Jack M. Harrowfield +2 more
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Antimicrobial Waterborne Polyurethanes Based on Quaternary Ammonium Compounds
, 2020Environmentally friendly waterborne polyurethane (WPU) composites were developed from polycarbonate diol (PCDL) and isophorone diisocyanate (IPDI), using 3-dimethylamino-1,2-propanediol (DMAPD) as a chain extender, followed by quaternizing by 1 ...
Yang Wang +7 more
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Di(phenylmercuri)ammonium compounds
Journal of the Chemical Society A: Inorganic, Physical, Theoretical, 1968Reaction of phenylmercuric acetate and phenylmercuric chloride with concentrated aqueous ammonia yields di(phenylmercuri)ammonium compounds, (PhHg)2+X–(X = OAc or Cl). The structures of these compounds and of the corresponding nitrate and sulphate have been established by infrared spectroscopy.
Glen B. Deacon, J.H.S. Green
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Diquaternary Ammonium Compounds as Transfection Agents
Bioconjugate Chemistry, 2001Diquaternary ammonium salts constitute a new class of reagent for mediating transfection of DNA in mammalian cell lines. N,N'-dioleyl-N,N,N',N'-tetramethyl-1,2-ethanediamine (TmedEce), N,N'-dioleyl-N,N,N',N'-tetramethyl-1,3-propanediamine (PropEce), N,N'-dioleyl-N,N,N',N'-tetramethyl-1,6-hexanediamine (HexEce), and their corresponding N,N'-dicetyl ...
Robert C. MacDonald +2 more
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Quaternary ammonium compounds in the Capparaceae
Biochemical Systematics and Ecology, 1996Abstract Fifty-five species and varieties of Capparaceae distributed in 17 genera have been examined for the presence of betaines and other quaternary ammonium compounds. Prolinebetaine and/or 3-hydroxyprolinebetaine were detected in all the species examined of Crataeva, Ritchiea, Maerua, Boscia, Capparis, Cladostemon, Cadaba, Thilachium, Morisonia
Kenneth Jewers +2 more
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Quaternary ammonium compounds and occupational asthma
International Archives of Occupational and Environmental Health, 2000Quaternary ammonium compounds, among which benzalkonium chloride is one of the best-known, are commonly used as antiseptics, disinfectants, detergents and preservatives. They can cause occupational asthma, which however, has been rarely reported so far, despite wide use of these products. We report three such cases.
C Moreau +5 more
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2002
Quaternary ammonium chlorides (QACs) occupy a unique niche in the world of antimicrobial compounds. Rather than being a single, well-defined substance, as is the case for many such active ingredients, QACs are composed of a diverse, eclectic collection of substances that share a common chemical motif, namely a molecular structure containing a positively
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Quaternary ammonium chlorides (QACs) occupy a unique niche in the world of antimicrobial compounds. Rather than being a single, well-defined substance, as is the case for many such active ingredients, QACs are composed of a diverse, eclectic collection of substances that share a common chemical motif, namely a molecular structure containing a positively
openaire +2 more sources