Results 171 to 180 of about 562 (194)
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Reaction of hydrazonoyl halides with N‐aryl substituted benzamidines
Journal of Heterocyclic Chemistry, 1980AbstractThe reaction between hydrazonoyl halides and N‐arylbenzamidines leads to the simultaneous formation of products derived from a substitution and a cycloaddition reaction via two independent paths.
Fulvio Anzani +2 more
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ChemInform Abstract: Reactions of C‐(Dialkoxyphosphoryl)hydrazonoyl Halides with Acid Salts.
ChemInform, 1991AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
B. I. BUZYKIN, M. P. SOKOLOV
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Journal of Heterocyclic Chemistry, 2016
New series of substituted thiazole and thiadiazoles were prepared starting from N′‐(3,4‐dihydronaphthalen‐1(2H)‐ylidene)hydrazinecarbothiohydrazide by reacting with different types of hydrazonoyl chlorides. In addition, 7‐(4‐chlorophenyl)‐5,6,6a,7‐tetrahydrobenzo [b]naphtha‐[1,2‐e][1,4]thiazepine reacted with hydrazonoyl halides to afford a new ...
Fatma A. A. El‐Hag +2 more
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New series of substituted thiazole and thiadiazoles were prepared starting from N′‐(3,4‐dihydronaphthalen‐1(2H)‐ylidene)hydrazinecarbothiohydrazide by reacting with different types of hydrazonoyl chlorides. In addition, 7‐(4‐chlorophenyl)‐5,6,6a,7‐tetrahydrobenzo [b]naphtha‐[1,2‐e][1,4]thiazepine reacted with hydrazonoyl halides to afford a new ...
Fatma A. A. El‐Hag +2 more
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Tautomerism and Reactions of 1H-1,2,4-Triazole-5-thiones with Hydrazonoyl Halides
Journal f�r Praktische Chemie/Chemiker-Zeitung, 1998The acid dissociation constants (Ka) of a series of 3,4-diaryl-1H-1,2,4-triazole-5-thiones (1) were determined and were found to correlated linearly with Hammett substituent constants; log Ka = 1.06 σx − 11.01. Such a result indicates that 1 exists essentially in one tautomeric form namely the thione form.
Mosselhi A. N. Mosselhi +4 more
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A new efficient synthesis of pyrazoles from hydrazonoyl halides and β-oxophosphonates
Tetrahedron Letters, 2014Abstract A new practical and efficient synthesis of 1,3,5-trisubstituted pyrazoles has been developed by reacting of hydrazonoyl halides with β-oxophosphonates under mild conditions in good yields with excellent regioselectivity. This process employs an addition–elimination sequence. Wide scope, functional group compatibility has been established.
Aixue Sun +4 more
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New Convenient Routes of Hydrazonoyl Halides for the Synthesis of Novel Thiazoles and Polythiazoles
Polycyclic Aromatic Compounds, 2020The present effort is to use good organized method for the synthesis of novel thiazoles from the reaction of different α-haloketohydrazonoyl halides with thiosemicarbazones in the basic medium at r...
Abdelwahed R. Sayed +3 more
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Reactions with Hydrazonoyl Halides. Part 15.1 A Synthetic Approach to 2,3-Dihydrothiadiazoles
Journal of Chemical Research, 1998Hydrazonoyl halides 1 and 6a–f reacted with methyl hydrazinecarbodithioate (2) and methyl 3-[1-(aryl)alkylmethylidene]hydrazinecarbodithioates (9a–d or 10a,b), in ethanolic triethylamine solution, to afford the corresponding 2-hydrazono-3,5-diphenyl-2,3-dihydro-1,3,4-thiadiazoles (3), 5-methyl-2-methylsulfanyl-6-phenylhydrazono-1,3,4-thiadiazine (8 ...
Hussein A. Emam +2 more
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Regioselectivity in the Reactions of Bis-hydrazonoyl Halides with Pyrimidine-2-thiones
Monatshefte fuer Chemie/Chemical Monthly, 2001Bis-hydrazonoyl chlorides react regioselectively with pyrimidine-2-thiones, which contain a masked thiourea residue, to give the hitherto unknown annelated 2,3-bis-arylhydrazono-thiazoles and 3,3′-bis-1,2,4-triazoles. Reaction of bis-hydrazonoyl chlorides with 2-methylthio derivatives gave only 3,3′-bis-1,2,4-triazoles.
Ahmad S. Shawali +2 more
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Phosphorus, Sulfur, and Silicon and the Related Elements, 2006
N-(chloro-furan-2-yl)methylene-N′-(4-nitrophenyl)hydrazone (I) reacted with triethylphosphite to produce the phosphonate derivative III. The tetrazine derivative VI was produced by the interaction of I with diethyl-phosphite. Hydrazonoyl azide derivatives VIIIa–c reacted with triphenyl phosphine to form the iminophosphorane derivatives Xa–c.
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N-(chloro-furan-2-yl)methylene-N′-(4-nitrophenyl)hydrazone (I) reacted with triethylphosphite to produce the phosphonate derivative III. The tetrazine derivative VI was produced by the interaction of I with diethyl-phosphite. Hydrazonoyl azide derivatives VIIIa–c reacted with triphenyl phosphine to form the iminophosphorane derivatives Xa–c.
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ChemInform, 2016
AbstractThe chemoselectivity of the title reaction is shown to be depending on the type of the utilized hydrazonoyl halide.
Ahmed Sami Shawali +2 more
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AbstractThe chemoselectivity of the title reaction is shown to be depending on the type of the utilized hydrazonoyl halide.
Ahmed Sami Shawali +2 more
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