Abstract
Magnified image A series of novel 2,10‐dichloro‐6‐phenylaminobenzyldibenzo[d,g][1 ,3,6,2]dioxa‐thiaphosphocin 6‐oxides were synthesized in two steps. In the first step, 5,5'‐dichloro‐2.2'‐dihydroxydiphenyl sulphide 1 was reacted with phosphorus tribromide in the presence of triethylamine in dry toluene at room temperature to yield an intermediate, phosphorobromodite 2. In the second step, 2 was treated in situ with aromatic aldehydes 3 and aromatic amines 4 in toluene at retluxing temperature ytelded the title compounds 5a‐h. Their structures were established by analytical, IR, NMR (1H, 13C and 31P) and mass spectra. Compounds 5a‐h have been screened for their antimicrobial activity. They exhibited significant antibacterial and antifungal activity.

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