A process for preparing compounds of the formula (II), ##STR1## where the substituents R.sup.1 to R.sup.5 are each independently H, CH.sub.3, straight-chain or branched C.sub.1 -C.sub.8 -alkyl, CH(OC.sub.1 -C.sub.5 -alkyl).sub.2, CH(C.sub.1 -C.sub.5 -alkyl)(OC.sub.1 -C.sub.5 -alkyl), CH.sub.2 (OC.sub.1 -C.sub.5 -alkyl), CH(CH.sub.3)(OC.sub.1 -C.sub.5 -alkyl), C.sub.1 -C.sub.8 -alkoxy, N(C.sub.1 -C.sub.5 -alkyl).sub.2, phenyl, substituted phenyl, aryl, heteroaryl, S(C.sub.1 -C.sub.5 -alkyl) or a radical C.sub.aryl, alkyl, and the symbols X.sup.1 to 5 are each carbon.

Ein Prozeß für das Vorbereiten der Mittel der Formel (ii), ## STR1 ##, wo die Substituenten R.sup.1 zu R.sup.5 jeder unabhängig H, CH.sub.3, gradkettiges oder ausgebrittenes C.sub.1 sind - C.sub.8 - Alkyl, CH(OC.sub.1 - C.sub.5 - alkyl).sub.2, CH(C.sub.1 - C.sub.5 - alkyl)(OC.sub.1 - C.sub.5 - Alkyl), CH.sub.2 (OC.sub.1 - C.sub.5 - Alkyl), CH(CH.sub.3)(OC.sub.1 - C.sub.5 - Alkyl), C.sub.1 - C.sub.8 - alkoxy, N(C.sub.1 - C.sub.5 - alkyl).sub.2, Phenyl, ersetzte Phenyl, Aryl, heteroaryl, S(C.sub.1 - C.sub.5 - Alkyl) oder ein radikales C.sub.aryl, Alkyl und die Symbole X.sup.1 bis 5 sind jeder Carbon.

 
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