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0342429871
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note
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4a,b of each corresponding key intermediate derived from commercially available 2,4,6-trimethoxybenzaldehyde via the several reaction steps.
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0343735068
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note
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3, R = 0.074.
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0342864398
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note
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4b,5
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19
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0343299479
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note
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Stable existence of the chiral plane in rac [6] and [7]metacyclophanes 3 (n = 3,4) at room temperature was verified by HPLC analysis employing the Shimadzu LC-6A instrument equipped with an SPD-6A UV detector as follows: Compound 3 (n = 3): chiral column, Daicel A(S)MBC, 4.6 mm i.d. X 25 cm; eluent, i-PrOH-hexane (1 : 40); flow rate, 1.0 rnL/min; detection, UV 254 nm; retention time of the racemate, 20.1 min and 22.6 min. Compound 3 (n = 4) : chiral column, Daicel CHIRALCELL OD, 4.6 mm i.d. X 25 cm; eluent, i-PrOH-hexane (1: 40) ; flow rate, 0.3 mL/min; detection, UV 254 nm; retention time of the racemate, 9.5 min and 10.8 min.
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0041998722
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23
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0343735066
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note
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3, R = 0.044.
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25
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0006448665
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0030005845
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Huang, D.4
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