Abstract Mild and environmentally benign Lewis acid promoted 1, 3-dipolar cycloaddition reactions of α-hydrazonyl chlorides with alkenes in water are reported. In the presence of Lewis acids, these α-hydrazonyl chlorides generate nitrile imines in situ, which then undergo reaction with a dipolarophile to furnish the corresponding cycloaddition product. In many cases, the required times for the completion of the Lewis acid promoted 1, 3-dipolar ...
