Reaction of triethyl orthoesters with various N,N′-dialkyl-α,ω-alkanediamines in the presence of ammonium tetrafluoroborate or hexafluorophosphate, all in the same molar ratio, affords cyclic amidinium salts in excellent yields.
原酸
三乙酯与四
氟硼酸铵或
六氟磷酸铵以相同的摩尔比存在下,与各种N,N'-二烷基-α,ω-链烷二胺反应,以极好的收率得到环状am盐。