Condensation of ethanedithioic acid with CS2 and 3 Li[HMDS] leads to the trianion 13 which is protonated to give the dimer 17 of tetrathiomalonic acid. Further deprotonation of 13 leads to the tetraanion 19 which is alkylated to form the tetrakis(alkylthio)allenes 20.
Condensation of ethanedithioic acid with CS2 and 3 Li[HMDS] leads to the trianion 13 which is protonated to give the dimer 17 of tetrathiomalonic acid. Further deprotonation of 13 leads to the tetraanion 19 which is alkylated to form the tetrakis(alkylthio)allenes 20.