Preparation methods for 11 organomercury compounds, mercury (II) trifluoroacetate, 4 organothallium compounds, 4 inorganic thallium (III) salts, thallium (I) ethoxide, and thallium (I) t-butylthiolate have been described. The price of the chemical and the name of the company which produces it are cited, when it is commercially available. The utility of each compound for representative organic synthesis and some of their chemical and physical properties (toxicity, reactivity to air and water, melting point etc.) have also been described.