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- W2951979314 abstract "The reactions of ketones (benzophenone, 4-methylbenzophenone, acetophenone, acetone, and 2,2,4,4-tetramethyl-3-pentanone) and C-acylimines with dimethylcyanamide in the presence of titanium(IV) chloride were investigated, Benzophenone and 4-methylbenzophenone react with dimethylcyanamide to give 4,4-disubstituted 2-dimethylamino-3-aza-1-oxa-1,3-butadienes 5 and 4,4-disubstituted 2-dimethylamino-1-N,N-dimethylcarbamoyl-1,3-diaza-1,3-butadienes 9. Ketones with enolizable hydrogen atoms undergo aldol reactions under these conditions. C-Acylimines 11b–11e, derived from benzil and substituted anilines, undergo [2 + 2] cycloaddition to dimethylcyanamide with subsequent ring opening to 1-(N,N-dimethylcarbamoyl)-2,3,4-triaryl-1,4-diaza-1,3-butadienes 15. 1,2-Diphenyl-2-(isopropylimino)ethanone (11a) reacts with dimethylcyanamide to give 2-dimethylamino-1-isopropyl-4,4-diphenyl-2-imidazolin-5-one (23) in a hitherto unknown multistep reaction. The structure of 23 was confirmed by an X-ray analysis." @default.
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- W2951979314 date "1996-10-01" @default.
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- W2951979314 title "Titanium(IV) Chloride Induced Reactions of Ketones andC-Acylimines with Dimethylcyanamide" @default.
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- W2951979314 doi "https://doi.org/10.1002/jlac.199619961027" @default.
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