R and R 'is benzhydryl, 9-fluorenyl, 2-fluorenyl, 9-fiuorenylethyl, 9-carbazylethyl, or 10- phenothiazinylethyl has been prepared. Quaternization of bis-(dialky1amino)-alkanes with benzhydryl bromide and 9-bromofluorene proceeded in excellent yield provided that solvolytic conditions were avoided. The compounds have been examined for neuromuscular blocking action, and several found to possess considerable activity. In particular, the bis-9- ...