Abstract
Frustrated Lewis pairs (FLPs) show some small molecule binding features that are remotely reminiscent of metal/ligand coordination. This is illustrated by examples of synergic binding of carbon monoxide (CO) or nitric oxide (NO) to the Lewis acid/Lewis base pairs of some intramolecular FLP systems. Various pathways of carbon monoxide reduction at FLP frameworks leading to the formyl stage and beyond are described. CO reactions at extended FLP systems containing multiple Lewis acid/Lewis base combinations lead to unusually structured products. The formation of macrocyclic oligomers upon treatment of some P/B/B FLPs with carbon monoxide are typical examples. Some carbon monoxide reactions of specifically substituted d0-configurated Group 4 bent metallocene complexes show remarkable similarities to typical reactions of the metal-free main group element FLPs.
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