The structure of the Meisenheimer complex has been determined by the X-ray method. The complex is characterized by a symmetrical structure, in which the two methoxyl groups are nearly equivalent to each other. The results showed a peculiar shape of the reaction intermediate, the substituted carbon atom is transformed into a tetrahedral shape, while the planarity of the whole molecule is kept with an increased conjugation between the nitro group and the ring system.
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Ueda et al. (1968) studied this question.
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