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[[File:Quaternary ammonium cation.svg|upright|thumb|[[Quaternary ammonium cation]]. The Rs may be the same or different groups. (The Rs may also be c In [[chemistry]], a '''quaternary compound''' is a compound consisting of exactly four chemical elements. ...

...=81|year=1987|doi=10.15227/orgsyn.065.0081|title=Methylenation of Carbonyl Compounds: (+)-3-Methylene-''cis-p''-menthane}}</ref><ref>{{cite journal | last1 = Ma ...ase is then subjected to methylation or N-oxidation to give a [[Quaternary ammonium cation|trimethylammonium salt]] or [[Amine oxide|amine ''N''-oxide]], which ...

====Quaternary ammonium==== ...and didecyldimethylammonium chloride). These last two are membrane-active compounds; against S. aureus the first forms a single monolayer coverage of the S. au ...

...expensive, and are used for specific applications.<ref name=Butt /> These compounds have both positively and negatively charged components. An example of a zwi ...neral, compounds with an HLB between one and four will not mix with water. Compounds with an HLB value above 13 will form a clear solution in water.<ref name="B ...

...ge=1| date=September 2010 |isbn= 9780470541944}}</ref> [[Surfactants]] are compounds that lower the surface tension of a liquid, the interfacial tension between ...ommon cationic surfactants head groups include [[amines]] and quaternary [[ammonium]] ions. ...

Silsesquioxanes have been functionalized with biocidal quaternary ammonium (QASs) groups to produce [[antimicrobial]] coatings. QASs are [[disinfectan ...itle=Antimicrobial activity of polysiloxane coatings containing quaternary ammonium-functionalized polyhedral oligomeric silsesquioxane|journal=J. Coat. Techno ...

...ember of the [[group 10 element|group 10]] of the [[periodic table]]. Most compounds in the group have an [[oxidation state]] of +2. Nickel is classified as a [ ...s, as nickel is adjacent to copper and iron in the periodic table can form compounds with the same structure as the [[high-temperature superconductor]]s that ar ...

...ent]] (DES). One of the most commonly used substances to obtain DES is the ammonium salt [[choline chloride]]. Smith, Abbott, and Ryder report that a mixture o ...equently used cationic liquids, include [[imidazolium]], [[pyridinium]], [[ammonium]] and [[phosphonium]]. Anionic liquids include halides, [[tetrafluoroborate ...

...the [[Complex (chemistry)|complex]]. There are two main kinds of complex: compounds formed by the interaction of a metal ion with a ligand and supramolecular c ...TP]], the background electrolyte used will be, for example, a [[Quaternary ammonium cation|tetralkylammonium]] salt. Another example involves iron(III) which f ...

...c Review and Quantitative Synthesis of the Efficacy of Quaternary Ammonium Compounds in Disinfesting Non-fungal Plant Pathogens |publisher=[[American Phytopatho ...