## Abstract

Following the previously described study of the reaction of sodium anthracene, A-, with 1,1diphenyl ethylene, D, giving the sodium salt of the dimeric dianion, -C(Ph)2. CH2. CH2C(Ph)o7, namely $2A^-_\cdot + 2D \rightarrow 2A + ^-DD^-$ we investigated now the reaction of disodium anthracene, A2- with D. It was shown that this extremely fast process produces a mixed dimer -AD-, $^-AD^-= Na+, ^-C(Ph)_2\cdot CH_2 --CH CH^-, Na^+$ which decomposes reversibly into A- q- D-. The virtually irreversible dimerization of D; into -DD- leads to complete decomposition of -AD- into A-q- 1/2-DD-. The kinetic studies of these processes allowed us to evaluate the relevant rate and equilibrium constants and forced us to reconsider the results of the previous study. The previously proposed mechanism of conversion of A7 q- D into A q- ~-DD- was found to be correct, namely $A^1\cdot + D^-\cdot$. The virtually irreversible dimerization of $D^-\cdot$ into $^-DD-$ leads to complete decomposition of $^-AD^-$ into $A^-\cdot + \frac{1}{2}^-DD&^-$. The kinetic studies of these processes allowed us to evaluate the relevant rate and equilibrium constants and forced conversion of $A^-\cdot + D$ into $A \frac{1}{2} ^-DD^-$ was found to be correct, namely \begin{equation*}\tag{1} A^-\cdot + D \rightarrow A + D^-\cdot (rapid equilibrium),\end{equation*}\begin{equation*}\tag{2}D^-\cdot + D \rightarrow ^-DD. (rate determining step),\end{equation*}\begin{equation*} \tag{3} ^-DD\cdot + A^1\cdot \rightarrow ^-DD^- (rapid electron transfer). \end{equation*}. In addition, side reactions, \begin{equation*}\tag{4} A^-\cdot + A \rightarrow A^2 + A,\begin{equation*} \tag{5} A^2 + D \rightarrow - AD^-,\end{equation*\begin{equation*}\tag{6}^- AD-\rightarrow A^-\cdot + D^-\cdot.\end{equation*} form a small amount of the transient mixed dimer $^-AD^-$. This transient was erroneously identified in the previous study as the monomeric radical-ion, $D^-$, and this mistake led to incorrect values of $K_1, k_2$ and $K_{diss}$., $^-DD^- \rightarrow 2D^-, \ldots(K_{diss}$. The corrected results derived from the present studies are $K_1 \approx 10^{-7}, k_2 = 800 l. mole^{-1 s^{-1}, K_{diss} \approx 10^{15} mole/l.$ The scheme was proved to be self-consistent, and the value K_1 was confirmed by the potential metric and equilibrium data.