1: 63 percent / diethyl ether; hexane / 1.5 h / -78 °C 2: (-)-B-isopinocampheyl-9-borabicyclo<3.3.1>nonane / 216 h / Ambient temperature View Scheme

diisopropylammonium hydrogen difluoride T=110°C; 8 h; other optically active epoxides; other HF*amine reagents; var. temperature; var. reaction time; Product distributionMechanism;