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?
 
 
 
 
    PrimoPyro
(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.

                                                    PrimoPyro

Wir pumpen..... (Klatschen) Sie oben!
 
 
 
 
    snitch
(Stranger)
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
 
 
 
 
    PrimoPyro
(Hive Prodigy)
03-04-02 17:56
No 276731
      Re: synthesis of benzaldehyde  Bookmark   

Have you read Patent US1280612 ?

Wir pumpen..... (Klatschen) Sie oben!
 
 
 
 
    Chemikaze
(Newbee)
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!
 
 
 
 
    PolytheneSam
(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)

http://www.geocities.com/dritte123/PSPF.html
 
 
 
 
    ChemicalSolution
(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.

xoxo
Julia
 
 
 
 
    Rhodium
(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).