Abstract
Thiolation of 1-alkyl-3-(2-quinolyl)quinolinium halides by a mixture of sulfur with KOH in DMF leads to formation of 1′-alkyl-1′,4′-dihydro-2,3′-biquinolyl-4′-thiones, rearrangement of which in boiling ethylene glycol makes it possible to obtain 4′-alkylthio-2,3′-biquinolyls.
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