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Carbohydrate‐Substituted Triarylphosphanes— A New Class of Ligands for Two‐Phase Catalysis
Author(s) -
Beller Matthias,
Krauter Jürgen Gregor Elmar,
Zapf Alexander
Publication year - 1997
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199707721
Subject(s) - catalysis , chemistry , tppts , phase (matter) , solvation , combinatorial chemistry , organic chemistry , polymer chemistry , inorganic chemistry , rhodium , ion , hydroformylation
Two‐phase catalysts with sugar‐substituted ligands , such as glycoside–triarylphosphanes 1 a–c , reveal advantages over catalysts with the classical TPPTS ligands in Heck and Suzuki reactions. A simple and generally applicable synthesis has been developed for this new class of neutral, hydrophilic ligands. On account of thermoreversible solvation, the concentration of the two‐phase catalyst in the nonpolar medium increases with increasing temperature, as shown by the Nernst distribution coefficient determined for one of the new ligands at different temperatures.