n-butyllithium in ethylene glycol dimethyl ether T=-78°C;

1: 1.) butyl-lithium, N,N,N',N'-tetramethyl-ethylenediamine / 1.) THF, -40 deg C, 1 h 2.) THF, -60 deg C, 30 min then warming to room temp. during 12 h 2: 96 percent / peracetic acid / CH2Cl2 / 1.) 0 deg C, 90 min 2.) 16 h, room temp. 3: 1.) butyl lithium / 1.) DME, -78 deg C, hexane, 20 min 2.) neat or DME, room temp. View Scheme

1: 96 percent / peracetic acid / CH2Cl2 / 1.) 0 deg C, 90 min 2.) 16 h, room temp. 2: 1.) butyl lithium / 1.) DME, -78 deg C, hexane, 20 min 2.) neat or DME, room temp. View Scheme