抄録
Several new nitro derivatives of sydnone compounds were synthesized by nitration of the sydnones with potassium nitrate in concentrated sulfuric acid.3-Benzylsydnone gave 3-(mnitrobenzyl)sydonone and 3- (m-nitrobenzy1)-4-nitrosydnone on treatment with 1-2 and 6 eq. moles of the nitrating agent, respectively. The nitration of 3, 4-diphenylsydnone occurred only at the p-position of the 4-phenyl ring. From these results (summarized in Table 1), the 3- and 4-sydnonyl groups are suggested to be electron-attractive and electron-releasing, respectively, showing a duality in electronic effect of the sydnone ring.
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