Scheme 2.
Synthesis of 4-aza-1,7-heptane-bis(N,N-dimethyl-N-alkylammonium) diiodides (19–21); 4-alkylaza-1,7-heptane-bis(N,N-dimethyl-N-alkylammonium) dibromides (12–16) and diiodides (17–18).
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