Please tell me if it is cyclohexene or cyclohexamine? P2np synthesis video. Thanks 
1-Phenyl-2-nitropropene (P2NP) Video Synthesis From Benzaldehyde and Nitroethane. Henry Reaction.
- Thread starter GhostChemist
- Start date
output is so racemicI tried the synthesis and I ended up with this solution. What is wrong with this? What do I do?
7.5 ml of benzaldehyde
6 ml of nitro ethane
3 ml of glacial acetic acid
1.8ml cyclohexylamine
Heating for 3,5 hours
What is wrong with the product of the reaction, something like the unreacted amine?
7.5 ml of benzaldehyde
6 ml of nitro ethane
3 ml of glacial acetic acid
1.8ml cyclohexylamine
Heating for 3,5 hours
What is wrong with the product of the reaction, something like the unreacted amine?
how much heat and with what? stirring?
oof, now I read carefully...you should use equal volumes of nitro benzo, that in your picture is unreacted benzaldehyde ofcourse
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no, equimolar is wasting reagents, I've tried, equal volumes simple as and it's the best yielding
well there you go, excess benzaldehyde, probably less than assumed nitroethane, mystery solved
- By wael gano
Equal volumes are true but excess benzaldehyde does not cause complete failure of the reaction
I'm supposed to get p2np crystals, a little product on the amount of nitro ethane and excess benzaldehyde, unreacted, washed with isopropanol
The product of the reaction now contains something unreacted, but I doubt that the reaction contains water
I've run a reaction before without adding acetic acid and haven't seen the water produced
I'm supposed to get p2np crystals, a little product on the amount of nitro ethane and excess benzaldehyde, unreacted, washed with isopropanol
The product of the reaction now contains something unreacted, but I doubt that the reaction contains water
I've run a reaction before without adding acetic acid and haven't seen the water produced
it's hard to say when you said yourself nitroethane was unpurified from synthesis, try to isolate product and do purification on that I guess
and again like you said, it might be the acetic acid, it is used a solvent and buffer in this reaction so it is normal to have it left over
and again like you said, it might be the acetic acid, it is used a solvent and buffer in this reaction so it is normal to have it left over
I always go by 1 part nitro 1 part benzo , 0.4 parts gaa (or less, whatever) , 0.05 parts catalyst (usulay ciclohexilo), first crop usually yields about as much grams as you put in volume of nitro benzo if a little less maybe, next crop another 10-15% at most of initial at which point it's not worth to milk anymore
- By wael gano
I am confused about this
I've done tuning before and had success with borates
used
3 ml of undistilled nitro ethane
3ml of benzaldehyde is good
0.5ml cyclohexylamine
A temperature of 50 degrees Celsius
5 hour reaction time
After that, cooling to room temperature, it became a black mass. I added water to it immediately. P2np crystals appeared in a dirty brown color.
She underwent biisopropanol lavage
The crystals are yellow with a good light orange
I've done tuning before and had success with borates
used
3 ml of undistilled nitro ethane
3ml of benzaldehyde is good
0.5ml cyclohexylamine
A temperature of 50 degrees Celsius
5 hour reaction time
After that, cooling to room temperature, it became a black mass. I added water to it immediately. P2np crystals appeared in a dirty brown color.
She underwent biisopropanol lavage
The crystals are yellow with a good light orange
possibly too long reaction time and amine degraded, plus it's about 3x the amine needed for that scale