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85039627588
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9 which prompted us to utilize cis-phenylpropenes or a mixture of cis-and trans-isomers as a cheaper and economical starting material. Among three isomers, cis-phenylpropene is generally present in high concentration e.g., β-asarone (cis-2,4,5-trimethoxyphenylpropene) is present upto 90% in tetraploid and hexaploid strains (distributed extensively in India, Pakistan, Japan and China) restricts the market potential of A. calamus oil.
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note
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2O-THF (10mL, 4:1) and irradiated for 40s to 2 min (Table 1) under microwave oven (2450 MHz, 900 Watts, Kenstar, India). The mixture was filtered and washed with dichloromethane. Evaporation of the solvent under reduced pressure gave a crude product, which was purified on silica gel column with hexane-ethyl acetate, 9:1 to 4:1 to afford 2a-2e.
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35
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2O-THF (50-60 mL, 4:1) and irradiated for 1 min in parts which provided 2a in 76% yield (based upon percentage of α-and β-asarone present in crude calamus oil).
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Sinha, A.K.1
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note
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