Archiv der Pharmazie p. 293 - 296 (1988)
Update date:2022-07-29
Topics:
Kallmayer, Hans-Joerg
Fritzen, Wolfgang
The blue 2-amino-3,5,6-tribromo-1,4-benzoquinones 4a-m are debrominated at C-3 by daylight yielding the violet 2-amino-5,6-dibromo-1,4-benzoquinones 5a-m.A comparison of the (13)C-NMR-spectra of 4a-m with those of 5a-m shows that this hypsochromic effect
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