methanol; carbon dioxide; tetra-n-butylammonium tetrafluoroborate T=50°C; P=71255.7 Torr; electrolysis: copper foil as cathode, platinum grid as anode, Ag quasi-reference electrode, -3.0 V, 2000 C; Yield given. Further byproducts given. Yields of byproduct given. Title compound not separated from byproducts;

tetra-n-butylammonium tetrafluoroborate T=50°C; P=71255.7 Torr; electrolysis: copper foil as cathode, platinum grid as anode, Ag quasi-reference electrode, -3.0 V, 2000 C; Yield given. Further byproducts given. Yields of byproduct given. Title compound not separated from byproducts;

tetra-n-butylammonium tetrafluoroborate T=50°C; P=71255.7 Torr; electrolysis: copper foil as cathode, platinum grid as anode, Ag quasi-reference electrode, -3.0 V, 2000 C; Yield given. Further byproducts given. Yields of byproduct given. Title compound not separated from byproducts;

sodium methylate in methanol; acetonitrile (anodic oxidation);

1: With polyethylsiloxane; LiTi(OPr-i)4 T=100°C; 24 h; 2: With sodium hydroxide in tetrahydrofuran 3 h; Heating;

sodium ethanolate