Isatin CAS 91-56-5 | Dye Intermediates
Isatin (CAS 91-56-5, EINECS 202-077-8, molecular formula C8H5NO2, molecular weight 147.13) is a dye intermediate product. Dye and pharmaceutical intermediate: in dyes for indigo, vat and sulfur dyes; in pharma for active ingredients of antiviral, sedative-hypnotic and antitubercular drugs; also an analytical reagent (nitrite and thiol detection) and organic synthesis building block.
I. Basic Product Information
| Chinese Name | 靛红 |
| English Name | Isatin |
| Aliases / Synonyms | Isatin; Indole-2,3-dione; 2,3-Indolinedione |
| IUPAC Name | 1H-indole-2,3-dione |
| CAS Registry No. | 91-56-5 |
| EINECS No. | 202-077-8 |
| Molecular Formula | C8H5NO2 |
| Molecular Weight | 147.13 |
| Suggested HS Code | 2921.4x (aromatic amines and their derivatives) |
| SMILES | C1=CC=C2C(=C1)C(=O)C(=O)N2 |
| InChIKey | JXDYKVIHCLTXOP-UHFFFAOYSA-N |
II. Technical Specifications & Supply Information
| Appearance | Orange to red crystalline powder (moist form); orange-red powder (dry form) |
| Assay / Purity | ≥98.0% / ≥99.0%（HPLC） |
| Grade | Industrial / Pharmaceutical Grade |
| Packing | 25 kg fiber drum (with inner PE liner); moist/dry form on request; 1 kg and 5 kg aluminium foil bags for small quantities |
| Standard | Enterprise standard / national standard (executed per batch COA) |
| Supply Capacity | Standard grades supplied from stock; bulk customization and long-term agreement supply supported |
| Documents Provided | COA and MSDS provided with each shipment; third-party SGS testing available for bulk orders |
| Storage Conditions | Store sealed, protected from light, in a dry and ventilated place, away from fire, heat sources and strong oxidizers |
III. Applications
Dye and pharmaceutical intermediate: in dyes for indigo, vat and sulfur dyes; in pharma for active ingredients of antiviral, sedative-hypnotic and antitubercular drugs; also an analytical reagent (nitrite and thiol detection) and organic synthesis building block.
IV. Quality & Supply Assurance
1. Stable batch-to-batch quality, with batch-by-batch inspection before shipment; a COA is provided with each delivery for full traceability;
2. Standard grades held in stock for fast delivery; bulk custom packing and long-term agreement supply supported;
3. Samples available on request, with third-party testing (e.g., SGS) to support incoming-material verification;
4. Our product line covers dye, pharmaceutical, agrochemical and organic pigment intermediates — a one-stop source for multi-category raw materials.
V. Frequently Asked Questions (FAQ)
Q: What are the CAS number and molecular formula of Isatin?
A: Isatin has CAS registry number 91-56-5, molecular formula C8H5NO2, molecular weight 147.13 and EINECS number 202-077-8.
Q: What are the main uses and applications of Isatin?
A: Dye and pharmaceutical intermediate: in dyes for indigo, vat and sulfur dyes; in pharma for active ingredients of antiviral, sedative-hypnotic and antitubercular drugs; also an analytical reagent (nitrite and thiol detection) and organic synthesis building block.
Q: What are the standard purity and grade of Isatin?
A: Standard supply purity ≥98.0% / ≥99.0% (HPLC), grade Industrial / Pharmaceutical Grade; custom assay and special specifications available on request — exact figures are per the batch COA.
Q: What are the packing specifications and minimum order quantity (MOQ) of Isatin?
A: Standard packing: 25 kg fiber drum (with inner PE liner); moist/dry form on request; 1 kg and 5 kg aluminium foil bags for small quantities. Samples available on request and custom packing supported; bulk orders can be delivered in batches per agreement.
Q: Can you provide COA, MSDS and other quality documents?
A: Dye and pharmaceutical intermediate: in dyes for indigo, vat and sulfur dyes; in pharma for active ingredients of antiviral, sedative-hypnotic and antitubercular drugs; also an analytical reagent (nitrite and thiol detection) and organic synthesis building block.
Q: How should Isatin be stored and transported?
A: Dye and pharmaceutical intermediate: in dyes for indigo, vat and sulfur dyes; in pharma for active ingredients of antiviral, sedative-hypnotic and antitubercular drugs; also an analytical reagent (nitrite and thiol detection) and organic synthesis building block.
VI. Keywords
Isatin, Isatin, Indole-2,3-dione, 2,3-Indolinedione, 91-56-5, Dye Intermediates
关键字： Isatin;Indole-2,3-dione;91-56-5;202-077-8;Dye Intermediates
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