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The (silylethynyl)- and the (tolylethinyl)-hydrazines 1a and 1b react with aryl isocyanates 2a-e and arylsulfonyl isocyanates 2f,g to form the corresponding substituted 3-arylimino-(or arylsulfonylimino-) 1,1,2-trimethyl-5-oxopyrazolidinium-4-ides 3a-h. The silyl group in the 4-position can be replaced by a hydrogen atom (formation of 6a-e). Heating of 6d in toluene induced the unequivocal transformation of the betaine to an isomer, the spectrocopic data of which are in concordance with those of the 4-quinolone derivative 7. Aroyl isocyanates 8 react in a [4+2]cycloaddition with 1a to furnish the 1,3-oxazin-4-ones 9a and b. The stannylated ynehydrazine 1c adds the cumulenic system of an aryl isocyanate (2d) across the Csp-Sn single bond, and trimethylstannyl N-(p-chlorophenyl)-3-(trimethylhydrazmo)propiolimidate 10 is isolated. With two molecules of 2d the hydantoin derivative 11 is formed.
- Himbert, Gerhard,Gerulat, Oliver
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p. 1196 - 1204
(2007/10/03)
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- THIOCYANATO-, BROMO-, AND CHLOROARYLATION OF TRICHLOROETHYLENE
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By reactions of arenediazonium salts with trichloroethylene in aqueous acetone in the presence of alkali metal thiocyanates, bromides, or chlorides, catalyzed by Cu(II) or Fe(II) salts, we synthesized 1-thiocyanato(bromo, chloro)-1,2,2-trichloro-2-arylethanes.These were treated with alcoholic potassium hydroxide to give α,β,β-trichlorostyrenes.Trichloroethylene is less reactive in the anionarylation than vinylidene and vinyl chlorides.
- Grishchuk, B. D.,Kudrik, E. Ya.,Gorbovoi, P. M.,Garmider, V. L.,Ganushchak, N. I.
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p. 1164 - 1166
(2007/10/02)
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- 5-amino or substituted amino 1,2,3-triazoles
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Novel 5-amino or substituted amino 1,2,3-triazoles are disclosed as having anticoccidial activity. The compounds are useful for controlling coccidiosis when administered in minor quantities to animals, in particular to poultry, usually in admixture with animal sustenance.
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- Photo-induced Conversion of Aryl(trichlorovinyl)nickel(II) Complexes into Two Isomeric Mono-organonickel(II) Complexes
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Photolysis (>330 nm) of trans- (Y= Me-4, Cl-4) resulted in the formation of two isomeric monoorganickel(II) complexes, trans- and trans-, possibly by reductive eliminati
- Wada, Masanori,Kumazoe, Makoto,Matsuhiro, Yasushi,Erabi, Tatsuo
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p. 1959 - 1962
(2007/10/02)
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