| 摘要 |
New process for the preparation of compounds of formula (I) in which R<1> represents alkyl C1-5, in particular methyl, ethyl, propyl isopropyl, and the two radicals R<2> represent independently of one another hydrogen or alkyl C1-5, in particular hydrogen or methyl, ethyl, propyl or isopropyl. The process is characterized by the hydrolysis of a compound of formula (II) in which R is alkoxy C1-4, chlorine, bromine or alcanoyloxy C1-4, R<1> and R<2> have the above meaning and R<3> is alkyl C1-4, and by the fact that the compound obtained is subjected to aldol condensation and, in the case where R = alkoxy C1-4, the reaction compound is again subjected to acid treatment. The compounds of formula (I) are mainly aromatics. |
