Abstract
The water-soluble, organotungsten Lewis acid, [O P(2-py) 3W(CO)(NO) 2](BF 4) 2 ( 1 ), was synthesized and characterized. A series of 1 -catalyzed Diels–Alder reactions were investigated under conventional heating or microwave heating conditions. The cycloaddition reactions were efficiently conducted in either water or in an ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate. The ionic liquid acts as a powerful medium not only for rate- and selectivity enhancements but also for facilitating catalyst recycling. Dramatic rate acceleration via microwave flash heating as compared to thermal heating was observed.
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