| abstract |
Tetralin or indan derivatives of the general formula (I) <IMAGE> in which R<1> and R<2> denote hydrogen or a methyl group, R<3> denotes hydrogen, an alkyl group having up to four carbon atoms or an alkoxy group having up to three carbon atoms, R<4> denotes a short-chain alkyl group, such as a methyl or ethyl group, and A denotes a methylene or ethyl radical which may be further substituted by alkyl groups, preferably a methyl group, and their preparation. |