Abstract
The 4,5-diformyl-1,3-dithiol-2-ylidene ethanals and ethanones 4 are prepared by a three-step sequence from acetylenedicarbaldehyde mono-diEt-acetal and 3-thioxo-1,2-dithioles. Their X-ray diffraction structure, 1H nmr and IR properties, reveal a δ-cis conformation in the solid state and in solution, due to strong S…O 1,5-internal bonding interactions.
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