diethyl ether

1: 1) iPr2NLi / 1) THF, hexane, 2 h, -60 deg C, 2) 1 h, r.t. 2: 2) 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / 1) CH2Cl2, 6 h, 2) 2 h View Scheme

2,3-dicyano-5,6-dichloro-p-benzoquinone 1) CH2Cl2, 6 h, 2) 2 h; Yield given. Multistep reaction. Yields of byproduct given;