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CI3Hz0O4S 272.10850)] and the double-bond isomer 28 [Rf 0.26; 13 mg; 38%; IR (CC14) 2965 (s), 2955 (s), 2900 (s), 2880 (s), 2840 (s), 1730 (s), 1635 (w), 1460 (s), 1370 (m), 1320 (m), 1300 (s), 1240 (m), 1130 (m), 1110 (m), 1085 (m), 1010 (m) cm-'; NMR (CCl,) 6 6.75 (1 H, q, J = 6.5 Hz), 5.7 (2 H, m), 4.2 (2 H, q, J = 7 Hz), 2.5 (6 H, m), 1.9 (3 H, d, J = 6.5 Hz), 1.55 (3 H, s), 1.3 (3 H, t, J = 7 Hz); m / e 272.10772 ( m / e calcd for CI3Hz0O4S 272.10850)l.

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