Facile syntheses and antimicrobial studies of 6‐(aryloxy/arylthio/chloroethoxy)‐2,10‐dichloro‐4,8‐dinitro‐12‐trichloromemyl‐12H‐dibenzo[d,g][13,2]dioxaphosphocin 6‐oxides

Synthesis of several novel 6‐aryloxy/arylmio/chloroethoxy‐2,10‐dichloro‐4,8‐dinitro‐12‐trichloro‐memyl‐12H‐dibenzod,g]1,3,2]dioxaphosphocin 6‐oxides ( 4a‐k ) was accomplished by reacting 2,2‐bis (2‐hydroxy‐5‐chloro‐3‐nitrophenyl)‐1,1,1‐trichloroethane 2 with different aryl phosphorodichloridates ( 3a‐g ) and O‐2‐chloroethyl phosphoryldichloride ( 3h ) in the presence of triethylamine in dry toluene at 60–65 °C. Actually some of these compounds were prepared by reacting monochloride 5 resulting from the condensation of phosphorus oxychloride with 2 in situ, with different phenols and thiophenols. The chemical structures were confirmed by elemental, ir and ¹H, ¹³C, ³¹P nmr and mass spectral data analyses. These compounds were screened for antifungal activity against Aspergillus flavus, Alternaria alternata, Fusarium solani, Curvularia lunata and Pyricularia oryzae and antibacterial activity on Bacillus subtilis, Staphylococcus aureus, Escherichia coli, Pseudomonas syringae and Klebsiella pneumoniae. Some of them possessed significant activity.