References
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- 1H-NMR of 1b: 1.89 (dd, J=2.3 and 3.4 Hz, 3H), 2.03(m, 2H), 2.41(m, 4H), 5.86(s, 1H), 6.20(m, 2H)ppm. 1HNMR of 1b: 1.59–2.16(m, 6H), 3.89(s, 2H), 5.01(m, 1H), 5.0(s, 1H), 5.85(s, 1H) ppm
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