Explanatory notes
… cation R 1 R 2 R 3 R 4 N + where R 1 , R 2 , R 3 and R 4 may be the same or different alkyl or aryl radicals (methyl, ethyl, tolyl etc.). This cation may be associated with the hydroxide ion (OH – ) to give a … parent ammonium hydroxide NH 4 OH. The residuary valence may , however, be filled by other anions (chloride, bromide, …