Abstract
AbstractThe standard enthalpy of formation of solid bis(2,2‐dimethylpropyl)magnesium (dineopentylmagnesium, Np2Mg) has been determined from its reaction enthalpy with aqueous hydrobromic acid and found to be ‐235.8 ± 5.5 kJ·mol−1. Using the experimentally determined sublimation enthalpy of Np2Mg and the enthalpies of formation of the 2,2‐dimethylpropyl radical and gaseous magnesium, the mean dissociation energy of the carbonmagnesium bond in the monomeric title compound is found to be 133.7 ± 5.0 kJ·mol−1. This value is discussed and compared with those of other reported carbonmagnesium bonds. In combination with the previously determined difference in enthalpy of formation of dimeric and monomeric Np2Mg, the bond energy of the bridging 2,2‐dimethylpropylmagnesium bonds in dimeric Np2Mg is calculated to be D̄B = 205 ± 3 kJ·mol−1, which is a remarkably high value.
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