snitch (Stranger)
03-04-02 12:27
No 276618
      synthesis of benzaldehyde  Bookmark   

I looked in my aromatic textbook and found the method you are referring to:
toluene + sulfuryl chloride + dibenzoylperoxide benzAL chloride
benzAL chloride + sodium hydroxide benzaldehyde.
This sounds messy. How would it be done in practice?
(Hive Prodigy)
03-04-02 12:56
No 276627
      Re: synthesis of benzaldehyde  Bookmark   

I do not know about that synthesis, but have you seen

../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.


Wir pumpen..... (Klatschen) Sie oben!
03-04-02 17:28
No 276723
      Re: synthesis of benzaldehyde  Bookmark   

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
(Hive Prodigy)
03-04-02 17:56
No 276731
      Re: synthesis of benzaldehyde  Bookmark   

Have you read Patent US1280612 ?

Wir pumpen..... (Klatschen) Sie oben!
03-04-02 20:26
No 276775
      Re: synthesis of benzaldehyde  Bookmark   

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!
(Master Searcher)
03-05-02 02:22
No 276958
      Re: synthesis of benzaldehyde  Bookmark   

The patents I posted in this thread use toluene and MnO2.
Post 208702 (Antoncho: "The easiest synth of benzaldehyde from toluene", Chemistry Discourse)
(Hive Bee)
03-05-02 09:00
No 277094
      Re: synthesis of benzaldehyde  Bookmark   

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.

(Chief Bee)
03-05-02 15:19
No 277166
      Re: synthesis of benzaldehyde  Bookmark   

Chlorox + tetrabutylammonium bromide (TBAB) also gives benzaldehydes from benzyl alcohols in high yield (see my page).