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[(Salcen)Cr(III) + Lewis base] was found to be a highly active and selective catalyst system in the [2+3] cycloaddition between epoxides and isocyanates to form 5-oxazolidinones. The reaction proceeds to high yield under mild reaction conditions and is applicable to a variety of terminal epoxides and aryl isocyanates.
One of the most well-known, highly utilized reagents for ether cleavage is boron tribromide (BBr 3), and this reagent is frequently employed in a 1:1 stoichiometric ratio with ethers. Density functional theory calculations predict a new mechan-istic pathway involving charged intermediates for ether cleavage in aryl methyl ethers. Moreover, these… (More)