In the presence of titanium(IV) chloride, the C-C bond-forming reaction of the α-cyanoketene
cyclic dithioacetal 1,3-dithiolan-2-ylideneacetonitrile with various aldehydes and
ketones afforded multifunctional pentanedinitriles, 3-substituted- or 3,3-disubstituted
2,4-di-1,3-dithiolan-2-ylidenepentanedinitriles, respectively, in good to excellent
yields under very mild conditions. A possible mechanism involving consecutive C-C
bond formation was proposed.
carbon-carbon bond-forming reaction - α-cyanoketene cyclic dithioacetal - aldehydes
- ketones - 2,4-di-1,3-dithiolan-2-ylidenepentanedinitriles