title: Stable pyrazolium betaines by addition of 1,1-dialkyl-hydrazines to acetylenecarboxylic esters.
mesh_terms: D001622:Betaine / Q000031:analogs & derivatives* / Q000138:chemical synthesis; D011720:Pyrazoles / Q000138:chemical synthesis*
chemical_list: D011720:Pyrazoles; D001622:Betaine