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Crotonaldehyde was converted to 1c as per the literature procedure (cf. Mori, A.; Arai, I.; Yamamoto, H.; Nakai, H. and Arai, Y. Tetrahedron, 1986, 42, 6447). Compounds 1a and 1b were procured by reducing 1c followed by methylation and benzylation respectively. For details see the experimental.
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1H NMR (400 MHz) analysis.
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