The interaction of homophthalic anhydride with (triphenylphosphoranylidene)acetates

Shablykin, O. V., Merzhyievsky, D., Shablykina, O. (2017). The interaction of homophthalic anhydride with (triphenylphosphoranylidene)acetates. French-Ukrainian Journal of Chemistry, 5(2), 62–67. https://doi.org/10.17721/fujcV5I2P62-67

In the study of the interaction of homo­phthalic anhydride and methyl (triphenyl­phosphoranylidene)­acetate, along with (1-oxo-1H-isochromen-3‑yl)acetate obtaining, two minor products – (1,3-dioxo-1,2,3,4-tetrahydronaphthalene-2-yl)acetate and 2‑((1‑oxo-1H-isochromen-3-yl)methyl)benzoic acid – had been isolated. The action of tert‑butyl (triphenyl­phosphoranylidene)­acetate on homo­phthalic anhydride didn’t lead to Wittig reaction; the encumbered ylide demonstrated only its basicity, and products of homo­phthalic anhydride self-condensation – 2‑((1‑oxo-1H-isochromen-3-yl)methyl)-benzoic acid and 12-hydroxy-5H-dibenzo[c,g]chromen-5-one – were formed.