Abstract
Tetradentate 1,1,4,4‐tetrakis(pyrazolyl)butane (1a) with a flexible backbone and 4,6‐bis[bis(pyrazolyl)methyl]dibenzofuran (1b) with a rigid linker between the bis(pyrazolyl)methyl groups readily form the corresponding 1:2 adducts 2a and 2b with trimethylalane. Coordination of AlMe3 to the pyrazolyl bases shows a negligible influence on the aromatic character of these π‐systems. In solution only one set of resonances is observed for the pyrazolyl substituents verifying a fast exchange equilibrium of AlMe3 between the pyrazolyl Lewis bases.
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