Ring closure reactions O 0130 Reactions with Hydrazonoyl Halides. Part 42. Synthesis of Some New 2,3-Dihydro-1,3,4-thiadiazoles, 2,3-Dihydro-1,3,4-selenadiazoles and Triazolino[4,3-a]pyrimidines. -The hydrazonoyl bromide (III) is used as precursor for the synthesis of a series of new heterocycles with a thia-or selenadiazole or a triazolo[4,3-a]pyrimidine structure. -(ABDELHAMID*, A. O.; ALKHODSHI, M. A. M.; Phosphorus, Sulfur Silicon Relat.

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2,3-Dihydro-1,3,4-thiadiazoles, pyrazoles, pyrazolo [3,4-d] Results and Discussion.

the new compounds were elucidated on the basis of elemental analysis, spectral data, and alternative methods of synthesis whenever possible.

Ring closure reactions O 0130Reactions of Hydrazonoyl Halides. Part 43. Synthesis of Some New 2,3-Dihy- dro-1,3,4-thiadiazoles, Pyrazoles, Pyrazolo[3,4-d]pyridazines, Thieno[2,3-b]pyridines, Pyrimidino[4',5':4,5]thieno[2,3-b]pyridines and Pyrrolo[3,4-d]pyrazoles.-In view of their potential as biologically active compounds, the synthesis of title compounds like (V), (VIII), (IX), (XIV), and (XVI) is carried out, essentially by the reaction of hydrazonoyl halides (IV) with alkyl carbodithioates, e. g. (III), propenone derivative (VII), and N-arylmaleimides. -(ABDELHAMID*, A. O.; ALKHODSHI, M. A. M.; J. Heterocycl. Chem. 42 (2005) 4, 527-533; Dep. Chem., Fac. Sci., Cairo Univ., Giza 12613, Egypt; Eng.) -H. Hoennerscheid 41-035