I am trying to synthesize P2NP for an experiment I'm documenting online, and I have a hard time.
17ml benzaldehyde were added to 35ml of (kind of anhydrous) ethanol, with 14ml nitroethane (the benzaldehyde was not distilled beforehand or washed with baking soda solution but was tested and had ph around 6, which meant no much benzoic acid contamination) and 4ml di-n-butylamine, and something like 2ml glacial acetic acid was added to reach neutral ph of 7.
No dean-stark trap was used, but it is said water would prevent good yield, which implies some yield at all.
This was boiled on reflux for about 3h and become dank orange. it was put off heat and cooled in the fridge. No crystals formed >:(. The solution still smelled like benzaldehyde, which makes me think the reaction is not complete.
So, what am I doing wrong?