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Dequatemization reactions

Tse-Lok Ho 3I) has explored the effectivness of the following four nucleophiles in dequatemization reactions sodium azide, sodium thiosulphate, thiourea and tri-phenylphosphine. Among.which, triphenylphosphine turned out to be the most effective demethylating agent. A strong solvent dependence on dequatemization has been demonstrated, indicating dimethylformamide as a superior solvent in all cases. In this manner, (2B.2.1]cryptand (44) was obtained from bisquaternary salt 43 in 87% yield (Scheme 11). [Pg.194]

Pyrazolino[2,3-c][l,2,3]triazoles, 5, 702 Pyrazolium hydroxide, l,2-dimethyl-3,5-diphenylanhydro-4-hydroxy-IR spectra, 5, 201 Pyrazolium salts dequatemization, 5, 269 H NMR, 5, 185 hydrogen exchange at ring carbon, 5, 245 mesoionic compounds, 5, 171 nitrodebromination, 5, 237 reactivity, 5, 217 reduction, 5, 68, 243 synthesis, 5, 156 UV spectra, 5, 199 Pyrazolium salts, amino-reactions, 5, 262 Pyrazolium salts, bromo-nucleophilic displacements, 5, 266 Pyrazolium salts, 1,2-dimethyl-deuteration, 5, 175, 245 hydrogen exchange, 5, 71 acid-catalyzed, 5, 239 reactions... [Pg.777]

See other pages where Dequatemization reactions is mentioned: [Pg.244]    [Pg.3493]    [Pg.244]    [Pg.3493]    [Pg.654]    [Pg.684]    [Pg.161]    [Pg.298]    [Pg.654]    [Pg.684]    [Pg.281]    [Pg.654]    [Pg.684]    [Pg.342]    [Pg.4]    [Pg.654]    [Pg.684]    [Pg.777]   
See also in sourсe #XX -- [ Pg.43 , Pg.189 , Pg.201 ]



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