New organomercurials of benzoquinone, barbituric acid and thiobarbituric acid with substituted aryl mercuric chloride have been synthesised using microwave irradiation under dry conditions in a domestic microwave oven in a few minutes with improved yields as compared to conventional heating. These organomercurials have a 1:1 stoichiometric ratio of aryl mercury and benzoquinone/barbituric acid/thiobarbituric acid moiety.