Effects of solvent viscosity on the rates of overall thermal decomposition, deazatization, and isomerization of several symmetric and unsymmetric cis-diazenes (cis-azoalkanes) have been determined in pure alkanes and mixtures of octane and mineral oil. Increasing viscosity decreases the overall decomposition and deazatization rates for all of these cis- diazenes. While isomerization rates also decrease with increasing viscosity for most of the ...