Helvetica Chimica Acta p. 854 - 859 (1985)
Update date:2022-08-11
Topics:
Fischer, Walter
Kvita, Vratislav
The novel 3-nitro-9-oxo-9H-xanthene- and 3-nitro-9-oxo-9H-thioxanthene-1-carboxylic acids 2a-d were prepared by intramolecular acylation of 3-aryloxy- and 3-arylthio-5-nitrophthalic anhydrides 1 (Scheme).The 3-nitro group was readily substituted by O- and
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(1989)
