The reactions of 2,2,2-trichlorobenzo-1,3,2-dioxaphosphole and its benzo-substituted derivatives with arylacetylenes containing strong +M-donors and -M-acceptors afford benzo[e]-1,2-oxaphosphinine 2-oxides (phosphacoumarins) in high yields. Studies by the competitive reaction method showed that the reaction rate is sensitive to the electronic nature of the substituent in arylacetylene. Thus, the introduction of +M-donors into the phenyl ring of arylacetylene leads to an increase in the reaction rate, whereas the introduction of -M-acceptors results in its substantial decrease. The molecular and supramolecular structures of selected 2-hydroxyphosphacoumarins and substituted vinylphosphonate, which is generated by the cleavage of the P-heterocycle, were studied by X-ray diffraction.
- 4,7-bis(tert-butyl)-2,2,2- trichlorobenzo-1,3,2-dioxaphosphole
- benzo[e]-1,2-oxaphosphorinine 2-oxides
- chlorination of the aromatic ring
- electronic effect of the substituent
- ipso-substitution of oxygen
- reaction rate
ASJC Scopus subject areas