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2,2,2,6-Tetrachloro-4-phenylbenzo[ e][1,2]oxaphosphinine and 2,2,6-trichloro-4-phenylbenzo[ e][1,2λ5]-oxaphosphinin-2-ylium hexachlorophosphate were prepared by treatment of 2,6-dichloro-4-phenylbenzo[ e][1,2λ5]-oxaphosphinine 2-oxide with phosphorus pentachloride. The structure of the latter compound was proved by means of X-ray diffraction analysis. [ABSTRACT FROM AUTHOR]

It was shown for the first time that 3-chloro-, 3-bromo-, and 3-iodopropynes can react with 2,2,2-trichloro-, 2,2,2-trichloro-5-methyl-, and 5,6-dibromo-2,2,2-trichloro-1,3,2λ5-benzodioxaphospholes to give derivatives of 4-(halomethyl)-2-chloro-2 H-1,2λ5-benzoxaphosphinin-2-ones. The reaction involves nonselective chlorination of the phenylene substituent in different positions, and the resulting isomer ratio is temperature-dependent. In the reactions of 3-bromo-and 3-iodopropynes with 2,2,2-trichloro-1,3,2λ5-benzo-dioxaphosphole, a side process takes place, viz. nucleophilic substitution of bromine and iodine with chlorine. The structure of some of the prepared 4-(chloromethyl)-1,2-benzoxaphosphinines was studied by means of X-ray diffraction. [ABSTRACT FROM AUTHOR]

A letter to the editor is presented regarding the mechanism and products formed by the reaction of 4-aryl-2,6-dichlorobenzo[e][1,2]oxaphosphinine 2-oxides I with organomagnesium reagents (Grignard reagents).

A letter to the editor is presented in response to the article about the high regio- and stereoselectivity of the chlorination of phosphinine I appeared in the previous issue of "Russian Journal of General Chemistry."