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Compounds 1a-c are commercially available. Alcohols 1d and 1f were obtained by an ultrasound catalyzed Barbier reaction; see: Luche, J. L.; Damiano, J. C. J. Am. Chem. Soc., 1980, 102, 7926-7927 and 1e was synthesized by addition of PhMgBr to veratraldehyde.
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