A FACILE ONE-POT SYNTHESIS OF METHYL(2E)-2-METHYLALK-2-ENOATES FROM BAYLIS-HILLMAN ADDUCTS UNDER MICROWAVE IRRADIATION

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• Spectral data obtained for 2a: 1H NMR (CDCl3): δ 2.13 (s, 3H), 3.63 & 3.83 (2s, 3H), 6.71 & 7.69 (2s, 1H), 7.19–7.42 (m, 5H). The peak at δ 7.69 was assigned to the olefinic proton of the [E]-isomer and a very minor peak at δ 6.71 was assigned to the olefinic proton of the [Z]-isomer in very small amounts (6%); 13C NMR (CDCl3): δ 13.72, 127.68, 128.47, 128.73, 129.89, 135.64, 141.21, 174.56; IR (KBr): 1712, 1620 cm−1
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