Reversible Addition of Carbon Dioxide to Main Group Metal Complexes at Temperatures about 0 °C

The reaction of dialane [LAl‐AlL] ( 1 ; L=dianion of 1,2‐bis[(2,6‐diisopropylphenyl)imino]acenaphthene, dpp‐bian) with carbon dioxide results in two different products depending on solvent. In toluene at temperatures of about 0 °C, the reaction gives cycloadduct [L(CO 2 )Al‐Al(O 2 C)L] ( 2 ), whereas in diethyl ether, the reaction affords oxo‐bridged carbamato derivative [L(CO 2 )(Et 2 O)Al(μ‐O)AlL] ( 3 ). The DFT and QTAIM calculations provide reasonable explanations for the reversible formation of complex  2 in the course of two subsequent (2+4) cycloaddition reactions. Consecutive transition states with low activation barriers were revealed. Also, the DFT study demonstrated a crucial effect of diethyl ether coordination to aluminium on the reaction of dialane 1 with CO 2 . The optimized structures of key intermediates were obtained for the reactions in the presence of Et 2 O; calculated thermodynamic parameters unambiguously testify the irreversible formation of the product  3 .