The Vespiary

The Hive => Methods Discourse => Topic started by: snitch on March 04, 2002, 12:27:00 PM

Title: synthesis of benzaldehyde
Post by: snitch on March 04, 2002, 12:27:00 PM
I looked in my aromatic textbook and found the method you are referring to:
toluene + sulfuryl chloride + dibenzoylperoxide à benzAL chloride
benzAL chloride + sodium hydroxide à benzaldehyde.
This sounds messy. How would it be done in practice?
Title: Re: synthesis of benzaldehyde
Post by: PrimoPyro on March 04, 2002, 12:56:00 PM
I do not know about that synthesis, but have you seen

https://www.thevespiary.org/rhodium/Rhodium/chemistry/benzylchloride.html (https://www.thevespiary.org/rhodium/Rhodium/chemistry/benzylchloride.html)



The last entry, chlorination of toluene with calcium hypochlorite, can be tweaked to give the same benzal chloride given in your synthesis.

                                                    PrimoPyro
Wir pumpen..... (Klatschen) Sie oben!
Title: Re: synthesis of benzaldehyde
Post by: snitch on March 04, 2002, 05:28:00 PM
Yeah i saw that when i was using TFSE
I have been unable to locate the patent though
this sounds like more of a hive bee sort of thing to do
im more a newbee so i'll prolly just get straight benz for 1st time
Title: Re: synthesis of benzaldehyde
Post by: PrimoPyro on March 04, 2002, 05:56:00 PM
Have you read

Patent US1280612 (http://l2.espacenet.com/dips/viewer?PN=US1280612&CY=gb&LG=en&DB=EPD)

?
Wir pumpen..... (Klatschen) Sie oben!
Title: Re: synthesis of benzaldehyde
Post by: Chemikaze on March 04, 2002, 08:26:00 PM
If you need benzaldehyde from toluene then UTFSE with my nickname (look for thread called New old amph synth).There you will find all details.In short it`s toluene and MnO2
Everybody in the house with a half an ounce
Not weed I meant coke dumb ass sit down!
Title: Re: synthesis of benzaldehyde
Post by: PolytheneSam on March 05, 2002, 02:22:00 AM
The patents I posted in this thread use toluene and MnO2.

Post 208702 (https://www.thevespiary.org/talk/index.php?topic=7285.msg20870200#msg20870200)

(Antoncho: "The easiest synth of benzaldehyde from toluene", Chemistry Discourse)
http://www.geocities.com/dritte123/PSPF.html
Title: Re: synthesis of benzaldehyde
Post by: ChemicalSolution on March 05, 2002, 09:00:00 AM
Benzh from benzyl alcohol in DMSO with dichromate and H2SO4 is easy, takes an hour and a half and the chemicals can easily be obtained OTC from non-science-non-chemical sources.

xoxo
Julia
Title: Re: synthesis of benzaldehyde
Post by: Rhodium on March 05, 2002, 03:19:00 PM
Chlorox + tetrabutylammonium bromide (TBAB) also gives benzaldehydes from benzyl alcohols in high yield (see my page).