Carbon‐13 NMR spectra of 1,6‐bis derivatives of hexa‐2,4‐diynes

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Abstract 13C NMR data for 1,6‐bis derivatives of hexa‐2,4‐diynes are reported. Introduction of a sulphone or sulphoxide moiety at C‐1, C‐6 in place of sulphide, ether or amino groups caused a 6–7 ppm upfield shift (β effect) for the C‐2, C‐5 carbons and a 3–4 ppm downfield shift (y effect) for the C‐3, C‐4 carbons.