A nitrone's the N-oxide of an imine and a functional group in organic chemistry. The general structure's R1R2C=NR3+O- where R3's different from H. A nitrone's 1,3-dipole in 1,3-dipolar cycloadditions. It reacts with alkenes to an isoxazolidine: » One example of this reaction type's the reaction of various Baylis-Hillman adducts with C-Phenyl-N-methylnitrone forming an isoxazolidine in which R1's phenyl, R2's hydrogen and R3's a methyl group . Nitrones react with terminal alkynes and a copper s… (More on Nitrone)