SweetChem (Stranger)
10-30-01 16:13
No 230495
      Piperonal from 3-4OH Bzaldehyde?  Bookmark   

I don't find any process to synthetize piperonal from 3-4 dihydroxybenzaldehyde. Is it possible to do like the first step of this synth with benzaldehyde insteed benzene?

[url=../rhodium/chemistry /safrole.html





... crazy synth for sweet dreams ...
 
 
 
 
    Rhodium
(Chief Bee)
10-30-01 16:37
No 230502
      Re: Piperonal from 3-4OH Bzaldehyde?  Bookmark   

3,4-dihydroxybenzaldehyde is also known as protocatechualdehyde.
Methylenation reactions can be found in ../rhodium/chemistry /methylenation.html#methylenation
 
 
 
 
    foxy2
(Distinctive Doe)
10-30-01 19:02
No 230530
      Re: Piperonal from 3-4OH Bzaldehyde?  Bookmark   

Post 225611 (foxy2: "Re: 4-Methylaminorex Synth w/o CNBr", Novel Discourse)

Post 225616 (foxy2: "Re: 4-Methylaminorex Synth w/o CNBr", Novel Discourse)

Keep reading.

Do Your Part To Win The War
 
 
 
 
    SweetChem
(Stranger)
10-31-01 14:26
No 230882
      Re: Piperonal from 3-4OH Bzaldehyde?  Bookmark   

Thanks !
But now the problem is that I don't own an autoclave. Is it possible to replace CH2Cl2 by CH2BR2(b.p. 97)and reflux the whole instead heat under presure?

... crazy synth for sweet dreams ...
 
 
 
 
    Rhodium
(Chief Bee)
10-31-01 16:59
No 230916
      Re: Piperonal from 3-4OH Bzaldehyde?  Bookmark   

Yes, dibromomethane or diiodomethane may be used instead. In the link I posted there are a PTC reaction which does not use an autoclave too.