suspensions of DNAN, 2-ANAN, or 4-
ANAN were agitated at 150 rpm and analyte concentration was
measured in the supernatant until constant values were measured.
Solubility was reached within 2 weeks for DNAN and 2-ANAN, and
3 months for 4-ANAN. For DAAN, an anoxic suspension (0.4 g/
10 mL) was prepared under argon to minimize decomposition
and polymerization, then sonicated for 5 min, capped and sealed
with an aluminum crimp and stirred at 150 rpm.