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Molecular Formula: C21H16Br2O5S
Molecular Weight: 540.22
EINECS: 204-087-8
Purity: 97% Min.
Package: 5 g / 25 g / 1 kg / 25 kg
CAS: 115-40-2 Bromocresol Purple
Bromocresol purple is mainly used as an acid-base indicator and a non-aqueous titration indicator.
SPECIFICATION OF CAS: 115-40-2 Bromocresol Purple
ITEMS | SPECIFICATION |
Melting point | 240 ¡ãC (dec.) (lit.) |
Color | Purplish-brown |
Storage temp. | Store at +5¡ãC to +30¡ãC. |
solubility | ethanol |
Merck | 14,1387 |
Fp | 36&²Ô²ú²õ±è;¡ã°ä |
Form | Solid |
EPA Substance Registry System | Bromcresol Purple (115-40-2) |
¦Ë³¾²¹³æ | 419nm, 433nm, 591nm |
Water Solubility | practically insoluble |
Density | 1.6509 |
Stability | Stable. Incompatible with strong oxidizing agents. |
Boiling point | 590.2 |
pka | 6.21, 6.3, 6.4(at 25¡æ) |
InChIKey | ABIUHPWEYMSGSR-UHFFFAOYSA-N |
PH Range | 5.2(yellow)-6.8(purple) |
BRN | 359618 |
PH | pH |
CAS DataBase Reference | 115-40-2(CAS DataBase Reference) |
Major Application | Waveguides, fuel cells, sensors, sol-gel technology, display device, falsification-proof security paper, paints, detergents, identifying fresh and stale rice, detecting lactic acid bacteria, dental materials, vaginal infection test method |
Synthesis of CAS: 115-40-2 Bromocresol Purple
Dissolve o-toluidine in dilute sulfuric acid, cool, add sodium nitrite solution while stirring, and control the reaction temperature below 5¡ãC.
After the reaction is completed, heat to 40-50¡ãC until no bubbles occur, cool and filter, and fractionate and refine the o-cresol. Mix o-cresol with o-toluenesulfonic anhydride and zinc chloroform, stir and heat with 365betÓéÀÖbook, react at 115-120¡æ for 7 hours, steam to remove the remaining o-cresol, filter to obtain o-cresol red: o-cresol red is refined Dissolve in glacial acetic acid, add a mixed solution of bromine and glacial acetic acid under stirring.
After the addition, heat at 40-50¡ãC for 4 hours, cool and filter to obtain bromocresol purple.
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