Low-temperature nmr kinetic studies have shown that trans-3-hexene molozonide underwent decomposition to ozonolysis products in dichlorodifluoromethane and in dimethyl ether-d6, solutions by a reaction that was firstorder in molozonide concentration. In the halogenated solvent propionaldehyde, ozonide and oligomer were formed early in the reaction, the aldehyde reached a relatively stable concentration, and ozonide was the predominant reaction product. In the ether solvent much more aldehyde was formed, and, again, it reached a relatively stable concentration. Oligomer appeared early in the reaction, evidence for ozonide did not appear until near the end of the first half-life, and oligomer was the principal reaction product. © 1969, American Chemical Society. All rights reserved.