| abstract |
A process for preparing compounds of the formula (II),where the substituents R<1 >to R<5 >are each independently H, CH3, straight-chain or branched C1-C8-alkyl, CH(OC1-C5-alkyl)2, CH(C1-C5-alkyl)(OC1-C5-alkyl), CH2(OC1-C5-alkyl), CH(CH3)(OC1-C5-alkyl), C1-C8-alkoxy, N(C1-C5-alkyl)2, phenyl, substituted phenyl, aryl, heteroaryl, S(C1-C5-alkyl) or a radical Caryl, alkyl, andthe symbols X<1 to 5 >are each carbon. |