A series of symmetrical and unsymmetrical acyclic amidinium hexafluorophosphates were prepared in good yields. Symmetrical N,N'-dialkyl-substituted formamidinium salts were produced by direct reaction of triethyl orthoformate with two equivalents of a 1o amine in the presence of ammonium hexafluorophosphate. N,N,N'-Trialkyl- and N,N,N',N'-tetraalkyl-substituted formamidinium salts were prepared by transamination of N,N-disubstituted formamidinium hexafluorophosphates using 1o and 2o amines, respectively.
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