Fig. 2: Scope of tertiary alcohols.

a Scope of diaryl tertiary alcohols. b Scope of dialkyl tertiary alcohols and triaryl tertiary alcohols. Variations of the standard conditions: 1n: (S)-BTM (10 mol%), rt; 1r: anhydrous Na2SO4 (150 mg), toluene, 0 °C, 11 h; 1x: rt, 20 h; 1y: −40 °C; 1aa–1ad: (S)-BTM (10 mol%), Na2SO4 (150 mg), toluene; 1ad: −20 °C. c conversion.