Ether Complexes R ·Grignard reagents O-R H H-C-Mg-X H H R-O© ·Electrophiles :OtB二H R H BH3·THF ·Crown ethers Chapter 14 Chapter 14 7 Ether Complexes • Grignard reagents • Electrophiles • Crown ethers O B H H H + _ BH3 THF =>