Ja. Ragan et al., Shock sensitivity of a vinamidinium bis-perchlorate reagent and demonstration of a lower energy alternative, SYNLETT, (8), 2000, pp. 1172-1174
"Vinamidinium" bis-perchlorate salt 1 (2-dimethylaminomethylene-1,3-bis (di
methylimmonio)-propane bis-perchlorate) was found to possess remarkably hig
h thermal energy as well as significant shock sensitivity. A reported metho
d for preparation of 2,5-disubstituted pyrimidines with 1 was of interest,
and we found that the corresponding bis-tetrafluoroborate salt 2 was equall
y effective in this transformation while possessing significantly lower the
rmal energy.