| abstract |
The invention relates to a process for the preparation of a, b ungesaettigten ethers of the general formula I RCHCHOCnH2n1 in the R: m0-10 and n1-4 mean, which u. a. used for the production of substituted acroleins and malonaldehydes. The aim of the invention is the preparation of a, b ungesaettigten ethers on an industrial scale with high yields. According to the invention, antioxidants are added to the reaction mixture in the thermal alkanol elimination according to equation 1; As phenothiazine, p-methoxyphenol, di-tert-butylcresol, gallic acid alkyl ester and p-tert-butyl-phenol. These additives make it possible to achieve the high yields described for small laboratory purposes also on an industrial scale. |