methyl ketones, generated in situ by treatment of 2-isocyanophenyl methyl ketones with sulfur in the presence of a catalytic amount of selenium and excess triethylamine, underwent electrocyclicreaction (ECR) via their enolate forms to give 4-hydroxyquinoline-2(1H)-thiones. The reaction products from ethyl 2-isothiocyanatophenyl ketones generated in situfrom the correspondingisocyanides under similar