[CH3:1][C:2]1([CH3:9])[CH2:7][CH2:6][C:5](=[O:8])[CH2:4][CH2:3]1.F[B-](F)(F)F.[CH2:15]([O:17][CH+:18][O:19][CH2:20][CH3:21])[CH3:16]>>[CH2:15]([O:17][CH:18]([O:19][CH2:20][CH3:21])[CH:4]1[CH2:3][C:2]([CH3:9])([CH3:1])[CH2:7][CH2:6][C:5]1=[O:8])[CH3:16]reacting 4,4-dimethylcyclohexanone, diethoxycarbenium fluoroborate and a fifth base to provide (2-(diethoxymethyl)-4,4-dimethylcyclohexanone and isolating or not isolating the 2-(diethoxymethyl)-4,4-dimethylcyclohexanone;
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