A safe and mild procedure for the synthesis ofmixed organic carbonates is described. Reaction of commercially available tetrabutylammonium methoxide andethoxide with carbon dioxide yields the corresponding methyl and ethyl tetrabutylammonium carbonates (TBAMC andTBAEC). The reactions of these new compounds with severaldifferent alkyl halides give methyl and ethyl carbonates inhigh yields. The use of classic toxic and harmful chemicalssuch as phosgene and carbon monoxide is avoided.