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Reaction of 4-methoxy-3′-alkylthio-3,4′-diquinolinyl sulfides 1a-d with a nitrating mixture led to the title sulfoxides 2a-d , but the same treatment of isopropylthio derivative 1e resulted in S-dealkylation and oxidation with formation of 3,3′-diquinolinyl disulfide 3 . 3′-Alkylsulfinyl group promotes nucleophilic methoxy-desulfidation of 4′-quinolinyl sulfur bond in sulfoxides 2 , as compared to that in sulfides 1 , in which case it leads to 3-quinolinyl sulfoxides 6 and 3-quinolinethiolate 4-A . [ABSTRACT FROM AUTHOR]