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Significant enhancement in the rate of Heck reactions has been achieved when catalytic amounts of Lewis acid (like FeCl 3 ) promoters in the presence of trace amounts of water (>2000ppm) are used along with Pd complex catalysts. Experiments with different aryl halides, bases as well as olefins have been carried out to demonstrate the role of Lewis acid promoters. The increase in the reaction...
The mixture of catalytically active ionic liquid, 1-methyl-3-(2-aminoethyl)imidazolium hexafluophosphate, and water has been found to be an environmentally friendly and recyclable reaction medium in the synthesis of 4H-pyrans derivatives under computer-controlled microwave irradiation.
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