Process for preparing aromatic methylene-dioxy compounds

Details Process for preparing aromatic methylene-dioxy compounds Process for preparing aromatic methylene-dioxy compounds

C - Chemistry, Metallurgy

07

D

260/351

C07D 317/48 (2006.01) C07D 317/50 (2006.01)

Patent

CA 1068287

ABSTRACT A process for preparing aromatic methylene-dioxy compounds by methylenation of aromatic ortho-dihydroxy compounds, wherein aromatic ortho-dihydroxy compounds, of formula Image in which R, which substitutes 1 to 3 positions in the benzene ring, may be an alkyl with 1 to 4 C atoms, an aldehyde, carboxyl, or alkoxy group with 1 to 4 C atoms, halogen or a nitro group, are reacted with methylene chloride in a concentrated aqueous solution, in the presence of particular ammonium, phosphonium or arsonium salts as catalysts, chosen from the group consisting of: a) quaternary ammonium salts of formula Image Br- in which R1, R2, R3, R4, the same or different, are alkyls with 2 to 8 carbon atoms. b) quaternary ammonium salts of formula Image X in which R is an alkyl of 10 to 20 carbon atoms, y= 1 to 12 X is C1 or Br. c) quaternary phosphonium or arsonium salts of formula Image y- in which X = P or As, R1, R2, R3, R4, the same or different, are linear alkyl radicals of 2 to 18 C atoms, y is C1 or Br.

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