carbon dioxide; lithium; CsO-t-Bu; methyl iodide 1) THF, -75 deg C; 2) -75 deg C, 30 min; Yield given. Multistep reaction. Yields of byproduct given;

lithium; CsO-t-Bu; methyl iodide 1) THF, -75 deg C; 2) -75 deg C, 30 min; Yield given. Multistep reaction. Yields of byproduct given;