Laser-induced Chemical Reactions. III. The Decomposition of Metal Salts of Carboxylic Acid and Selective Decomposition

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Various copper metal salts of organic acid were decomposed by laser heating and conventional heating methods. The product distributions were reasonably explained in terms of the expected reaction of the decarboxylated intermediates. Generally the yield percentage of products is higher in laser decomposition than in thermal decomposition. However, in maleate and fumarate the product distribution is quite different in thermal and laser decompositions. The main product is ethylene in the thermal decomposition, but acetylene in the laser decomposition. This difference may be the result of the heating rate. Since rapid heating and quenching are characteristic of laser heating, the formation of acetylene may be brought about by the simultaneous decarboxylation of two carboxyl groups, while the formation of ethylene may be brought about by successive decarboxylation. Selective decomposition by laser heating will also be discussed in binary systems, such as maleate and ethylene.
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