Over the years, methods have been developed for the preparation of quaternary ammonium compounds, which are important as organic intermediates, detergents, insecticides, bacteriostats, and drugs [1, 2]. The most common method for preparation of these compounds is by alkylation of tertiary amines [3, 4]. Primary and secondary amines have also been quaternized, albeit less frequently [3, 4], due ...

Azoproteins, obtained by the coupling of diazonium ions with the histidyl, tyrosyl, and lysyl groups of proteins, have continued to be materials of utility since their early investigation (1). The ease with which proteins can be modified by this procedure, the variety of aromatic amines that can be used, and the correlation that can be made between the chemical structure of the introduced group...