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Chromone-2- and chromone-3-hydroxymethanephosphonic- as well as chromone-2- and chromone-3-methanephosphonic acids and esters were synthesized.

Chromone-2- and chromone-3-hydroxymethanephosphonic- as well as chromone-2- and chromone-3-methanephosphonic acids and esters were synthesized.

4,4-Dichloro-4H-1-benzopyran-2-carbonyl chloride in the reaction with tertiary phosphites forms two stereoisomeric products (E) and (Z). The mechanism of their formation and the structure has been suggested.

4-Oxo-4H-1-benzopyran-3-carbonyl chloride forms in a Michaelis-Arbuzov reaction the corresponding α-ketophosphonate. As a result of further Michaelis-Arbuzov and Perkow reactions with tertiary phophites 4-oxo-4H-1-benzopyran-2-carbonyl chloride forms two stereoisomeric products (E) and (Z). The mechanism of their formation and the structure has been suggested on the basis of spectroscopic dates and reactions with proton nucleophilic reagents.