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- [32] KETEN DITHIOACETALS .12. SYNTHESIS AND REACTIONS OF ALPHA-OXOKETENE DITHIOACETALS DERIVED FROM HETEROCYCLIC KETONES - REACTIONS OF 3-[BIS(METHYLTHIO)METHYLENE]-2,3-DIHYDRO-1-BENZOTHIOPYRAN-4-ONE, 4-[BIS(METHYLTHIO)METHYLENE]-3,4-DIHYDRO-1-BENZOTHIEPIN-5(2H)-ONE AND 1-N-(P-TOLYLSULPHONYL)-3-[BIS(METHYLTHIO)-METHYLENE]-2,3-DIHYDRO-4(1H)-QUINOLONE WITH HYDRAZINE, GUANIDINE, CYANOACETAMIDE, AND N-ALKYLCYANOACETAMIDESH JOURNAL OF CHEMICAL RESEARCH-S, 1979, (08): : 3001 - 3054