1: 96 percent / pentane / 1) 0 deg C, 3 h 2) 23 deg C, 7 h 2: 1) NaH / 1) THF, 23 deg C, 3 h 2) 23 deg C, 6 h View Scheme

sodium hydride 1) THF, 23 deg C, 3 h 2) 23 deg C, 6 h; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;