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(a) UV/Vis absorption spectrum of 2‐cyclohexenone (1, CH2Cl2, c=1.0 mM, rose; c=50 mM, red) and (b) its variation (c=1.0 mM) upon addition of 0 equiv. (black), 0.5 equiv., 1.0 equiv., 2.0 equiv., 5.0 equiv. and 10.0 equiv. of BF3⋅OEt2 (formation of 2, blue).
