Several series of novel N′-tert-butyl-N′-substituted-benzoyl-N-[di (octa) hydro] benzofuran {(2, 3-dihydro) benzo [1, 3]([1, 4]) dioxine} carbohydrazide derivatives Ia, Ib, IIa− IIg, IIIa, IIIb, and Va− Vc were designed and synthesized. Their structures were confirmed by 1H NMR spectra, HRMS, and X-ray single-crystal structures. The larvicidal activities against oriental armyworm, beet armyworm, diamond-back moth, and corn borer of these compounds ...