Application of a new class B-podands in solid–liquid phase transfer catalysis

Abstract

As a continuation of our earlier systematic study, this paper reports on the performance of boron polypodands 1– 8 (B-podands) as catalysts in a series of anion promoted reactions (nucleophilic substitution, reduction, N- and O-alkylation) in chlorobenzene, toluene and acetonitrile solutions carried out in the solid–liquid (SL) phase transfer catalysis (PTC) conditions. Comparison of the catalytic efficiency (expressed by observed rate constants) of 1– 8 with that of well known classical phase transfer catalysts: crown ethers, polyethylene glycols (PEG) ( 9, 10) and previously studied Si-podands ( 11, 12) is also included.