Syntheses of cyclohepta-3,6-diene-1,2,5-trione, p-tropoquinone

Itô, Shô; Shoji, Yoshikazu; Takeshita, Hitoshi; Hirama, Masahiro; Takahashi, Kiyoshi

doi:10.1016/s0040-4039(00)72061-2

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1986

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Cited by 12 publications

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“…4). Whereas the mass spectra of the [3.3]cyclophanes 51 and 52 show strong fragment ions due to three consecutive losses of CO, as in p-tropoquinones in general, 38 those of the more strained 49 and 50 exhibit only two losses of CO, indicating that the elimination of the third CO requires higher energy. These features also appear in structure 51, but to a lesser extent.…”

Section: Structurementioning

confidence: 99%