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LETTER
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(18) Typical Experimental Procedure.
Tri-tert-butylphosphine [P(t-Bu)3, 3.9 mg, 0.019 mmol])
was placed in a round-bottomed flask under N2. Dry DMF
(0.25 mL) and 2-naphthaldehyde (1b, 30 mg, 0.19 mmol)
were added. To the stirred solution, Me3SiCF3 (57 mL, 0.38
mmol) was added at r.t. The mixture was stirred at r.t. for 0.5
h; the reaction was concentrated under reduced pressure. The
residue was chromatographed on silica gel using hexane to
afford 2b in 99% yield.
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