Issue Date: December 8, 2014
Changing Course With Carbenes
As chemists have come to better understand the correlation between catalyst design and selectivity, a theme has emerged in which researchers seek to make different products from the same reactants simply by altering the catalyst. In a new example, Frank Glorius and coworkers at the University of Münster, in Germany, switched the reactivity of enals with hydrazones in cycloaddition reactions to make 1,2-diazepines or pyrazoles, depending on the choice of N-heterocyclic carbene . . .
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