Structure of 89-20-3
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The BI-3802 was designed by Boehringer Ingelheim and could be obtained free of charge through the Boehringer Ingelheim open innovation portal opnMe.com, associated with its negative control.
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| CAS No. : | 89-20-3 |
| Formula : | C8H5ClO4 |
| M.W : | 200.58 |
| SMILES Code : | O=C(O)C1=CC=C(Cl)C=C1C(O)=O |
| MDL No. : | MFCD00044755 |
| InChI Key : | DVIPPHSQIBKWSA-UHFFFAOYSA-N |
| Pubchem ID : | 6964 |
| GHS Pictogram: |
|
| Signal Word: | Warning |
| Hazard Statements: | H302-H315-H319-H335 |
| Precautionary Statements: | P261-P305+P351+P338 |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.

| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| A. 5-Chloro-1,3-isobenzofurandione <strong>[89-20-3]4-Chlorophthalic acid</strong> (446.5 g, 2.23 mol) was heated neat until H2 O was no longer released to give compound A (415.9 g, quantitative), melting point 138-140 C. | ||
| EXAMPLE IX In a conventional acidic hydrolysis, the 4-chlorophthaloyl chloride or 4-chlorophthalonitrile of Examples 7 or 8 is hydrolyzed to <strong>[89-20-3]4-chlorophthalic acid</strong> which, upon dehydration at over 180-200 C., will afford a high yield of 4-chlorophthalic anhydride. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| Step 2; A solution of the previous acid (802.9 mg, 4 mmol) in tetrahydrofuran was added to a cooled (-75 C) slurry of lithium aluminum hydride, 95% (320.6 mg, 8 mmol) in tetrahydrofuran over 25 min. period. The reaction mixture was allowed to warm up to room temperature then heated to reflux for 18 hours. The reaction mixture was quenched with water, 15% sodium hydroxide, and water in ice bath. The separated organic layer was dried to yield 607.8 milligrams of 4-chlorobenzen-1,2-dimethanol. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| With acetic anhydride; In ethyl acetate; toluene; | Its 4-bromo-analog melts at 208-211. The starting material is prepared as follows: The mixture of 36 g of <strong>[89-20-3]4-chlorophthalic acid</strong> and 250 ml of acetic anhydride is refluxed for 2 hours and evaporated. The residual 4-chlorophthalic anhydride is dried in a high vacuum and 27.8 g thereof refluxed in 480 ml of toluene together with 23.1 g of 4-nitro-o-toluidine for 1 day. It is cooled the precipitate filtered off, washed with benzene and dried at 80/0.1 mmHg, to yield the corresponding amide melting at 185-188. The mixture of 35 g thereof and 250 ml of acetic anhydride is refluxed for 2 hours and evaporated. The residue is dried, taken up in the minimum amount of hot ethyl acetate, the solution treated with charcoal, filtered, the filtrate cooled and the precipitate formed collected, to yield N-(4-nitro-o-tolyl)-4 chlorophthalimide melting at 221-222. | |
| With acetic anhydride; In ethyl acetate; toluene; | Its 4-bromo-analog melts at 208-211. The starting material is prepared as follows: The mixture of 36 g of <strong>[89-20-3]4-chlorophthalic acid</strong> and 250 ml of acetic anhydride is refluxed for 2 hours and evaporated. The residual 4-chlorophthalic anhydride is dried in a high vacuum and 27.8 g thereof refluxed in 480 ml of toluene together with 23.1 g of 4-nitro-o-toluidine for 1 day. It is cooled, the precipitate filtered off, washed with benzene and dried at 80/0.1 mmHg, to yield the corresponding amide melting at 185-188. The mixture of 35 g thereof and 250 ml of acetic anhydride is refluxed for 2 hours and evaporated. The residue is dried, taken up in the minimum amount of hot ethyl acetate, the solution treated with charcoal, filtered, the filtrate cooled and the precipitate formed collected, to yield N-(4-nitro-o-tolyl)-4-chlorophthalimide melting at 221-222. |