Abstract:
The invention provides a process for preparing m- or p-substituted phenylalkanols of the formula (I) in which R 1 is m- or p-bonded to the phenyl ring and is C 1 -C 5 -alkyl, and R 2 , R 3, R 4 and R 5 are each independently hydrogen or methyl, which is characterized in that an unsubstituted phenylalkanol of the formula (II) in which R 2 , R 3 , R 4 and R 5 are each as defined for formula (I) is alkylated together with a C 1 -C 5 -alkyl halide of the formula (III) R 1 Hal (III), in which R 1 is as defined for formula (I) and Hal is halogen, in the presence of a Friedel-Crafts catalyst, to give an m- or p-alkyl-substituted phenylalkanol of the formula (I), then the reaction mixture is worked up and the desired m- or p-alkyl-substituted phenylalkanol of the formula (I) is removed, the remaining by-products formed are returned to the reaction mixture and these are isomerized in the presence of a Friedel-Crafts catalyst to give the desired m- or p- alkyl-substituted phenylalkanol. The m- or p-alkyl-substituted phenylalkanols of the formula (I) can be used to form, by oxidation or dehydrogenation, as products of value, the corresponding aldehydes, which are of interest as fragrances and aroma chemicals.
Abstract:
The present invention relates to 3 tert.-butyl benzaldehyde- dimethylacetal and 3 tert.-butyl benzylmethylether and to an electrochemical method for producing 3 tert.-butyl benzaldehyde- dimethylacetal and to intermediates produced by same.
Abstract:
The invention relates to a method for electrochemically cleaving lignin by means of a diamond electrode and to a method for producing vanillin and the derivatives thereof by electrochemically cleaving lignin in a solution having a pH-value of
Abstract:
The invention relates to a method for producing an m-substituted alkyl toluene of formula (I), R 1 being C 1 -C 5 -alkyl, characterized in that a p-substituted alkyl toluene of formula (II), where R 1 has the meaning indicated in formula (I), is isomerized in the presence of ionic liquids, forming an m-substituted alkyl toluene of formula (I). The m-substituted alkyl toluene obtainable according to the invention is a starting compound for producing fragrances and flavorings.