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A simple method for design of some novel 1,2-benzoxaphosphinines  2 – 9 , was achieved. The methodology depended on cyclization of 1-(2-hydroxy-phenyl)-3-phenylpropane-1,3-dione ( 1 ) as starting material with some phosphorus halides in dry solvent in the presence of a base. Reaction of the substrate  1  with some phosphorus halides, such as P,P-dichlorophenylphosphine, phenyl phosphonic dichloride, phenyl phosphorodichloridate, and phosphorus oxychloride in dry toluene containing triethylamine led to a predominant formation of 3-benzoyl-4-hydroxy-2 H -1,2-benzoxaphosphinines  2 – 5 , respectively. Under the same reaction conditions, the molecular structures of type 3-benzoyl-4 H -1,2-benzoxaphosphinin-4-ones  6  and  7  were isolated by treatment of the substrate  1  with phosphorus pentachloride and phosphorus tribromide, respectively. In addition, the interesting 4-(1-phenyl-ethanoyl)-1,2,λ 5 -benzoxaphosphinines  8  and  9  were obtained by treatment of compound  1  with acetonyl and benzyl triphenylphosphonium chlorides, respectively, in dry dioxane and sodium hydride. The chemical structures of the title compounds were established by elemental analysis and spectral tools.

Reaction of 1-(2-hydroxyphenyl)-3-phenylpropane-1,3-dione with some phosphorus halides: A simple synthesis of novel 1,2-benzoxaphosphinines