1: 70 percent / LiAlH4 / tetrahydrofuran; diethyl ether / 0.5 h / 55 °C 2: 60 percent / titanium trichloride, LiAlH4 / tetrahydrofuran; diethyl ether / 3 h / Ambient temperature 3: 7 percent Spectr. / O-mesitylenesulfonyl hydroxylamine / CH2Cl2 / 0.17 h / -95 °C View Scheme

1: 70 percent / LiAlH4 2: 60 percent / LiAlH4, TiCl3 / tetrahydrofuran / 3 h / Ambient temperature 3: O-mesitylenesulfonyl hydroxylaminme (MSH) / CH2Cl2 / -95 °C View Scheme

1: 70 percent / LiAlH4 / tetrahydrofuran; diethyl ether / 0.5 h / 55 °C 2: 60 percent / titanium trichloride, LiAlH4 / tetrahydrofuran; diethyl ether / 3 h / Ambient temperature 3: 80 percent / O-mesitylenesulfonyl hydroxylamine / CH2Cl2 / 0.17 h / -95 °C View Scheme