Abstract:Five analogs of ageratochromene were synthesized and their inhibitory effect on plants and microorganisms were compared with that of ageratochromene. Results showed that two analogs,6 formyl 7 methoxyl 2,2 dimethy1 2H benzopyran and 7 hydroxyl 6 formyl 3,4 dihydro 2,2 dimethyl 2H benzopyran had higher inhibitory effects on two plants:radish and ryegrass than that of ageratochromene at concentration of 100mg/l,especially inhibited the root growth of plants significantly.They also possessed st...