Z. Arnold et al., CONVENIENT PREPARATION OF 1,3-BIS(DIMETHYLAMINO)TRIMETHINIUM PERCHLORATE, TETRAFLUOROBORATE AND HEXAFLUOROPHOSPHATE, Collection of Czechoslovak Chemical Communications, 61(11), 1996, pp. 1637-1641
Formylation of ethyl vinyl ether with (chloromethylene)dimethylammoniu
m chloride prepared from dimethylformamide and oxalyl chloride or phos
gene followed by successive treatment with dimethylamine and 70% perch
loric acid leads to 1,3-bis(dimethylamino)trimethinium perchlorate la
in high yield. Similarly, work-up of the reaction mixture after formyl
ation with hexafluorophosphoric acid or dimethylamine tetrafluoroborat
e afforded 1,3-bis(dimethylamino)trimethinium hexafluorophosphate 1b o
r tetrafluoroborate 1c, respectively.