Synthesis of a bifunctional boron-Lewis acid and studies on host-guest chemistry using pyridine and TMPD

Rudlof J, Neumann B, Stammler H-G, Mitzel NW. Synthesis of a bifunctional boron-Lewis acid and studies on host-guest chemistry using pyridine and TMPD. Zeitschrift für Naturforschung B, Journal of Chemical Sciences . 2021.Based on the previously described bifunctional Lewis acid with a functional distance of the boron functions of 4.918(2) angstrom, the development of a further bifunctional, boron-containing Lewis acid with a wider functional distance is demonstrated. Again, a stannylated precursor was used and the Lewis-acidic boron functions were introduced by means of tin-boron exchange. The general suitability of this class of compounds for the formation of host-guest-complexes is demonstrated by NMR experiments and by solid-state structures using pyridine and TMPD (N-1,N-1,N-4,N-4-tetramethylbenzene-1,4-diamine) as Lewis basic guests. The influence of traces of moisture on the boron-containing, bifunctional Lewis acids was investigated by the structure elucidation of a decomposition product