2,2,6,6-tetramethyl-1-oxopiperidinium hexafluoroantimonate in acetonitrile T=20°C; 4 h;

water; copper(II) oxide in acetone 1.) room temp., 5 h, 2.) 40 deg C, 1 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

water; calcium carbonate; methyl iodide in acetonitrile 1.) 40 deg C, 3 h; 2.) room temp., 15 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;