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

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.

Graphical abstractWe have reported the systematic study on the use of boron polypodands (B-podands) as catalyst in a series of anion promoted reactions (nucleophilic substitution, reduction, N- and O-alkylation) in chlorobenzene, toluene and acetonitrile solutions carried out under solid–liquid (SL) phase transfer catalysis (PTC) conditions.Figure optionsDownload full-size imageDownload as PowerPoint slide