Substituted Methoxybenzene Derivatives: C₈H₉NO₄, C₉H₁₁NO₅ and C₁₃H₁₈O₄

The structures of three methoxybenzenes, namely 1,2-dimethoxy-4-nitrobenzene, C₈H₉NO₄ (I), 1,2,3-trimethoxy-5-nitrobenzene, C₉H₁₁NO₅ (II), and 1-(2,4,5-trimethoxyphenyl)-1-butanone, C₁₃H₁₈O₄ (III), are reported. Molecules of (I) and (III) are planar but one of the three methoxy groups of (II) is twisted out of the phenyl ring plane as a result of steric hindrance. In all three solids the molecules are linked to form centrosymmetrically hydrogen-bonded dimers; they are packed in parallel layers in (I) and (II) but as zigzag layers in (III).

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