N-Peralkyl-tetraamino-p-benzoquinones react with oxidants to form crystalline dication salts. Reductive acylation gives rise to 1,4-bisacyloxy-2,3,5,6-tetraaminobenzenes which can be oxidized to benzene dication salts.doi:10.1016/S0040-4039(00)84074-5Rudolf...