Kinetics of nitrosation of aniline by N,O, in donor non-aqueous solvents, e.g. acetonitrile, ethylacetate and a 1 : 1 v/v mixture of both, have been studied. The reaction is first-order with respect to N,O, and zero-order with respect to aniline in each of the donor solvents added. The average observed order of kThe variation ofk values in the different solvents is interpreted in terms of solvation ability of the solvents. Conductivity measurements and U.V. studies of N,O, solutions are reported. Both the initial and integral rate methods show that the rate-determining step is the one which involves the formation of the nitrosating agent, NO+, from N,O,. Accordingly a mechanism of nitrosation is proposed.
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