1.1: lithium diisopropylamide / tetrahydrofuran / 2 h / 0 °C 1.2: 85 percent / tetrahydrofuran / -78 - 20 °C 2.1: 34 percent / sodium periodate; Na2HPO4; NaH2PO4 / tetrahydrofuran; H2O / pH 7 View Scheme