1: 1) butyllithium / 1) THF, hexane, -70 deg C, 0.5 h, 2) -70 deg C, 0.5 h, 3) room temp. 2: 1) dicyclohexylborane, 2) 30percent H2O2, N,N,N',N'-tetramethylethylenediamine, 3 M aq. NaOH / 1) 0 deg C, 2 h, THF, 2) 0 deg C, 1 h; also with bis(1,2-dimethylpropyl)borane View Scheme

sodium hydroxide; N,N,N',N,-tetramethylethylenediamine; bis(cyclohexanyl)borane; dihydrogen peroxide 1) 0 deg C, 2 h, THF, 2) 0 deg C, 1 h; also with bis(1,2-dimethylpropyl)borane; Yield given. Multistep reaction. Yields of byproduct given;

Yield given. Multistep reaction;