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Synthesis 1987; 1987(1): 76-77
DOI: 10.1055/s-1987-27855
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A Simplified Procedure for the Preparation of 1,2-Dichloro-1-N,N-dialkylamino)ethenes and 2-Chloro-1,1-bis((dialkylamino)ethenes

R. van der Heiden* , L. Brandsma
  • *Department of Organic Chemistry of the State University, Padualaan 8, Utrecht, The Netherlands
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Publication Date:
20 August 2002 (online)

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1,2-Dichloro-1-(N,N-dialkylamino)ethenes (3; Alkyl = CH3 or C2H5) are obtained by reaction of dichloroacetylene, prepared in situ from trichloroethene and lithium dialkylamide in ether with an excess of dialkylamine. Further reaction of the compounds 3 with an excess of dialkylamine at 30° or at reflux gives the chloroketene aminals 4. The dimethylamino derivatives can also be obtained by adding trichloroethene to a suspension of sodamide in dimethylamine.

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