Tetrachlorophthalic anhydride → 4,4',5,5',6,7-hexachloro-3',6'-dihydroxy-3H-spiro[isobenzofuran-1,9'-xanthen]-3-one

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Treatment of tetrachlorophthalic anhydride (5 g, 17.49 mmol) and 2-chlororesorcinol (7.58 g, 41.98 mmol) according to the procedure described in Example 1, Step 1, provided 9.3 g of the crude product. Suspension of 8 g of the crude 9.3 g in DMF:water (1:1), followed by filtration provided 8.65 g (16.05 mmol, 91.7% AUC yield) of 4,4′,5,5′,6,7-hexachloro-3′,6′-dihydroxy-3H-spiro[isobenzofuran-1,9′-xanthen]-3-one that was isolated as an orange solid. 1H NMR (300 MHz; DMSO d6) δ 11.09 (S, 2H), 7.03 (d, J=9 Hz, 2H), 6.81 (d, J=8.7 Hz, 2H).

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