The invention relates to a method for transesterifying methyl methacrylate involving catalysis, particularly zirconium acetylacetonate catalysis. The process employs metal-catalyzed coupling reactions to provide a carbonate or carbamate of formula or or a substrate that can be reduced to obtain the same. Rectified DC from a full wave rectifier is passed to a pair of inductors that are alternately sinking and sourcing current thereby drawing a more uniform input current because current constantly flows through the full wave rectifier to both of the inductors.