Synthesis of benzyl alcohol and benzoic acid (Cannizzaro reaction)

[@rovingcloudspsk7036]

It's helpful to everyone who want to understand Cannizaro reaction practically. Thank you for such a nice detailed explanation of the reaction. Nicely explained.

[@ScatteredParticles]

Two syntheses for the price of one! Excellent technique and meticulous work throughout. This should be required watching for novice synthetic chemists.

[@RaExpIn]

Thanks! This is actually a synthesis I had done back thenn at the university and I always wanted to try it again.

[@dwaynezilla]

Ohhh yeah. This is some good stuff right here. Watching your process and results was very interesting and relaxing, haha. Also, love the look of those final crystals.

[@petkotzvetkov6528]

Great videos please keep goin!

[@ICCPL0355]

I was surprised by your method for removing the excess aldehyde. it is excellent and I will use it in my own lab in future. thanks for you efforts.

[@jamesg1367]

Very well presented, great camera work too.

[@RaExpIn]

Thanks! :)

[@mizra7]

thank you so much for the video, it was not only useful but interesting to me

[@mikaljan]

Thanks for continue making great videos and interesting reactions! 👏👏👏👏👏

[@cheeryweeb134]

Wow, incredibly clean synthesis!

[@toledojack88]

Ive never seen a recrystallization done like that, cool

[@johnathancorgan3994]

Your meticulous attention to detail in these is great. It's only missing a good Pink Floyd outro...

[@amirradzhabov5187]

Very nice work👍

[@netspirit79]

Thanks a lot! How would you remove benzyl alcohol from the water layer (benzyl alcohol is sparingly soluble in water)?

[@RaExpIn]

When the aqueous layer contains benzyl alcohol and is shaken with a solvent like MTBE, diethylether or dichloromethane, the alcohol will dissolve in the organic layer, until it's at a specific equilibrium (depends on the solvent). The equlibrium will be on the side of the organic layer, because the benzyl alcohol is more soluble in it. So, it can be said: More washings lead to a higher yield at this step, but at some point the amount of alcohol in the aqueous layer becomes negligible. That's why the number of washings is often about 3 to 5 times and rarely above 10.

[@NicholasA231]

Gotta get myself an Abbe refractometer. I have a quality handheld one, but after seeing how useful it could be trying cleanly to separate methanol and ethanol (much harder than you think, or at least than I expected) I started trying to use it for everything. An Abbe would be so much better - and I wouldn't have to convert my readings from °Bx.

[@RaExpIn]

Yes, the Abbe refractometer is one of the most useful things I have got, when doing organic chemistry. Separating ethanol and methanol should work with a vigreux column, as these don't seem to form an azeotrope. Or you would have to do several distillations.

[@gamingbeastsl3541]

Very useful for practical session

[@dribrahimel-nahhal2477]

Great vid! Thanks

[@aniketnikam1279]

Hiiii I want this experimental procedure plz

[@nikolatrajkovic3720]

Can u use Sodium hydroxids?

[@keithji1728]

Nice video

[@nazishfarooq4810]

AssalamOalikum Sir why we use oil bath with replace of wath bath

[@RaExpIn]

Distilling off the diethylether has to be done very carefully. So, water is used to prevent the heat from going higher than 100°C, if the hot plate might fail in any way. The oil can go up to around 230°C, but the ether vapors can ignite at around 170°C.

[@aemensidra5532]

Water bath se maximum 100c temperature attain hota h.agr hmny 100c se zyada heat krna ho or hmary pas hot plate ki range se zyada ho to oil bath use krty hn q k oils zyada heat ho sakty hn oil bath se 250c tk heat kia ja sakta h

[@tomasmarz6713]

Hello, Is vacuum distillation of benzyl alcohol necessary? Does decomposition occur at the boiling point of benzyl alcohol? I found the same instructions in the Czech scripts of organic chemistry, but the reason for using vacuum distillation was not given. Thank you for your answer Tomáš

[@RaExpIn]

It's a rule of thumb to use vacuum distillation, when a boiling point is higher than 160°C, because many organic compounds tend to decompose at around this temperature. Benzyl alcohol is with 205°C way beyond that point.

[@tomasmarz6713]

@@RaExpIn Thank you for answer. Yes I know that. I was just talking about the benzyl alcohol. I couldn't find out if the benzyl alcohol decomposed at the boiling point. My vacuum pump is broken. Currently I only have a classic water pump (it is good for filtration), but a bit cumbersome for vacuum distillation.

[@MrMiki434]

the only reaction named after an italian chemist!

[@RaExpIn]

That's nice to know :)

[@user-NeoLionni]

if my mixture become yellow after rest for 24 hours, is there any possible side product of this reaction?

[@anthonyvargas8255]

What a great video! the only doubt about it is how the micro destilling bridge can help to increase the yield uu

[@RaExpIn]

Thanks! The micro distilling bridge has less volume and less surface area for droplets to form or get stuck on. So, when distilling smaller amounts, this increases the yield.

[@زيدالجبوري-ب2ل]

Good work.. And high techniqu

[@elandabell1183]

What is citicoline

[@justinnagai82]

does anyone know where I can get a write-up of this method or of a method similar?

[@RaExpIn]

Unfortunately, this method is from a german book about organic chemistry, called Organikum, but I'm sure that there are enough papers and books about it.

[@secretstranger1898]

Awesome thank you

[@ottowalter2519]

Why did you use freshly destilled benzaldehyde? The presence of the benzoic acid shouldn't disturb the reaction...

[@RaExpIn]

Usually, the concentration of benzoic acid in benzaldehyde is unknown and can be very high. Even "freshly" bought benzaldehyde could be somewhat oxidized. This could decrease the yield of benzyl alcohol by a lot or even neutralize enough potassium hydroxide to keep the residual aldehyde from reacting at all. And it would make calculating a yield quite useless. To be honest: I wouldn't do all this work with the risk of a low yield.

[@michaelf7093]

I need the reverse reaction, acid to aldehyde. Or acid to alcohol.

[@Pooja-h1p5p]

Theory hai sir ????

[@ВикторПятница-н8с]

Ты сделай из бенойной кислоты,бензальдегид😂

[@hackerinah1809]

I'm great full to you