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The carbon magnetic resonance spectra of four positional acetylenic thia fatty acid methyl ester isomers have been recorded to investigate the effect of the sulfur atom on the chemical shifts of the carbon nuclei adjacent to it. Methyl 6-thia-10-octadecynoate (6). Rf 0.4 (PE10); 1 H-NMR δ 3.66 (3H, s, OMe), 2.61 (2H, t, J = 6.8, 7-H), 2.52 (2H, t, J = 6.8, 5-H), 2.34 (2H, t, J = 7.0, 2-H), 2.0-2.2 (4H, m, 9-H and 12-H), 1.6-1.9 (6H, m, CH 2 ), 1.2-1.5 (10H, m, CH 2 ), 0.88 (3H, t, Me); 13 C-NMRdoi:10.3998/ark.5550190.0003.321 fatcat:g6ubjoxfrjbpvbghhvvhsg43cq