boring ethyl groups would very much increase if Ni(OEPMe2) were dehydrogenated to , -dimethyloctaethylporphinatonickel(II), Ni(ODM). Therefore, Ni(OEPMe2) is air-stable. Ni(ODM) may be obtained, however, by metal insertion into the parent porphine.19 In Ni(ODM), the methyl • • • methylene carbon contacts are expected to be substantially smaller than the ^3.9A contacts found for Ni(OEPMe2). Indeed, if Ni-(ODM) has the same highly ruffled core of Ni(OEP),31b the nonbonded contacts can be calculated to be an unreasonably tight 2.8 Á. Hence, Ni(ODM) must represent a metalloporphyrin with a severely distorted core.

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Untersuchung der EPR‐ und Elektronenspektren.