Tetrakis[3,5-Di(f-Methyl)phenyl]borate as the First Efficient Negatively Charged Phase Transfer Catalyst. Kinetic Evidences

Remarkable accerelation was observed by use of sodium tetrakis[3,5-di(F-methyl)phenyl]borate as a negatively charged phase transfer catalyst for diazonium ion in the azo coupling reactions of aryldiazonium tetrafluoroborate with a range of diazophile components in liquid–liquid- and liquid–solid two-phase systems. Kinetics of the reactions was examined to confirm the phase transfer catalysis.