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The bisoctahydroxanthen-1,8-dione derivatives were synthesized effectively via p-dodecylbenzene sulfonic acid the catalysed cyclocondensation of cyclic 1,3-dicarbonyl compounds with 1,3-or 1,4-benzene dicarboxaldehydes in water. The products were obtained with yield ranged from 75 to 95%. The structures of compounds were characterized by FT-IR, 1 H-NMR and elemental analysis. The antimicrobial properties of compounds against pathogens were investigated by the disc-diffusion method. These compounds were evaluated for potential antimicrobial activity against Gram-positive (Staphylococcus aureus, Bacillus cereus, S. epidermidis and Nocardia canis), Gramnegative bacteria (Escherichia coli, Proteus vulgaris and Pseudomonas aeroginosa), yeasts (Candida albicans and Rhodotorula rubra) and mold (Aspergillus niger). The growth of S. aureus, B. cereus, S. epidermidis, E. coli, C. albicans, R. rubra and A. niger were inhibited by 3f and 3g compounds. All compounds were resistant against Gram-negative bacteria (Proteus vulgaris and Pseudomonas aerginosa) and results were upon comparison with reference discs.