42 parts β-dimethylaminoethyl ester hexamethylene biscarbamic acid in 350
parts of acetone was added to 100 parts methyl bromide. The reaction
product was fallen after 24 hours at room temperature and was recrystallized
from ethanol or a mixture of methanol and acetone to give 56.7 parts of
choline bromide hexamethylenedicarbamate (hexacarbocholine bromide). Yield
87%. MP: 174°-176°C.
