Abstract
Abstract The molar susceptibilities of eight N-arylsydnones were measured by the Gouy method. Assuming that the influence of the conjugation between aryl and sydnonyl groups on diamagnetism is practically negligible, the molar susceptibility of unsubstituted sydnone was estimated as 38.7. Its isotropic part 24.57 was evaluated from the values for five of the contributing ionic forms calculated by the Gray-Cruick-shank’s method. From the magnitude of the exaltation of molar susceptibility which is equal to one third of an anisotropic part, the author suggested that the aromatic character of a sydnone ring is in the same order with those of furan and pyrrole rings. Four derivatives of N-phenylsydnone which have a substituent in meso-ionic ring were also measured, and the agreements between the observed and the calculated molar susceptibilities were found to be good within the limit of the latter’s estimation.
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