HETEROCYCLIC NITROGEN COMPOUNDS .6. PREPARATION OF 2,3-DIHYDRO-3-OXOSPIRO(ISOINDOLE-1,3'-BENZO[B]THIOPHEN)-2'-CARBOXYLIC ACID SS-DIOXIDE BY SCHMIDT REACTION ON BENZO[B]NAPHTHO[1,2-D]THIOPHEN-5,6-QUINONE SS-DIOXIDE
D O I:
10.1039/j39690001149
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