The intermolecular and intramolecular reductive coupling reactions of arylmethylidenemalononitriles induced by SmI2 have been studied. The configuration of the cyclodimerization products, 4,5-trans-isomers of 2-amino-1,3,3-tricyano-4,5-diarylcyclopentenes, has been confirmed by X-ray analysis and a possible reaction mechanism is proposed.
L. Zhou and Y. Zhang, J. Chem. Soc., Perkin Trans. 1, 1998, 2399 DOI: 10.1039/A802510J
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