Onium ion Lewis acid (generic) 4 Reactions utilise: Onium ion Lewis acid (generic)   Special class of generic used to represent "generic chemical reactivity behaviour" rather than structure. Read more about the different types of Lewis acid, Lewis base and Lewis acid/base complex in the Chemogenesis web book and here. Wikipedia Page: Onium ion Lewis acid (generic) is defined with respect to the entities below: The entities below are defined with respect to: Onium ion Lewis acid (generic) Aldehyde, protonated (generic) Alkyl alkoxy hydroxy carbenium ion (generic) Alkyl oxonium ion (generic) 1° Alkyl oxonium ion (generic) Alkyl telluronium ion (generic) Amide, protonated (generic) Ammonium ion 1° Ammonium ion (generic) 2° Ammonium ion (generic) 3° Ammonium ion (generic) 4° Ammonium ion (generic) Aqueous mineral acid, 0.05 to 1.0 molar (generic) Argonium ion Aronium ion (generic) Arsonium ion Arsonium ion (generic) Benzene diazonium ion Benzonium ion Brønsted acid, oxonium (generic) Bromonium ion tertiary Butyl oxonium ion Carbenium ion, beta-amino (generic) Carbenium ion, beta-ether (generic) Carbenium ion, beta-thioether (generic) Carbonium ion Carboxylic acid, protonated (generic) Chloronium ion Chloronium ion, alkyl (generic) Dialkyl oxonium ion (generic) Dialkyl telluronium ion (generic) Dialkylhydroxy carbenium ion (generic) Diazonium ion (generic) Difluorochloronium ion Dihydroxymethyl carbenium ion Dimethyl sulfonium ion Dimethylammonium ion Dimethylformamide, protonated Dimethylhydroxy carbenium ion Dimethyloxonium ion Dimethylsulfoxide, protonated Diphenylammonium ion Duteronium ion Eigen Cation Ethenyl bromonium ion Ethylacetate, protonated Ethylbenzene SeAr intermediate Fluoronium ion Fluoronium ion, alkyl (generic) Guanidine, protonated Hydrazinium ion Hydronium ion, [H3]+ Hydroxy acid, protonated (generic) Hydroxy carbenium ion Hydroxyammonium ion Hydroxydialkoxy carbenium ion (generic) Hydroxymethyl carbenium ion Imidazonium ion Iodonium ion Iodonium ion, alkyl (generic) Isopropyl oxonium ion Kryptonium ion Methylammonium ion Methyloxonium ion Methylsulfonium ion Methyltriethylammonium ion Neonium ion Nitric acid, protonated Nitrilium ion (generic) Nitrobenzene SeAr intermediate Nitrobenzene, protonated Nitromethane, protonated Oxonium ion Phenyl ammonium ion (generic) Phenylammonium ion Phenylethanone SeAr intermediate Phenyloxonium ion Phosphonium ion Phosphonium ion (generic) Phosphonium ion, alkyl triphenyl (generic) Protonated base, [H-B]+ (generic) Pyridinium ion Pyrylium ion Selenonium ion Stibonium ion Sulfonium ion Sulfonium ion, alkyl (generic) Sulfonium ion, dialkyl (generic) Telluronium ion Tetrahydrofuran, protonated Tetramethylammonium ion Thiocarbenium ion (generic) Thiopyrylium ion Trialkyloxonium ion (generic) Trialkylsulfonium ion (generic) Triethylarsonium ion Trimethylammonium ion Trimethyloxonium ion Trimethylphosphonium ion Trimethylsulfonium ion Trimethylsulfoxonium iodide Trimethylsulfoxonium ion Triphenyloxonium ion Urea, protonated Xenon fluoride cation Xenon, protonated Ylid (generic) Zundel cation chemical compound molecule metal molecular science reaction mechanism ionic material acid base geometry reactivity synthesis science knowledge chemistry Lewis