1(4H)-Naphthalenone, 4-(alpha-(4-hydroxy-1-naphthyl)benzylidene)- (8CI)
p-Naphtolbenzein
CAS: 145-50-6
Molecular Formula: C27H18O2
1(4H)-Naphthalenone, 4-(alpha-(4-hydroxy-1-naphthyl)benzylidene)- (8CI) - Names and Identifiers
1(4H)-Naphthalenone, 4-(alpha-(4-hydroxy-1-naphthyl)benzylidene)- (8CI) - Physico-chemical Properties
| Molecular Formula | C27H18O2 |
| Molar Mass | 374.43 |
| Density | 1.0946 (rough estimate) |
| Melting Point | 230-235°C(lit.) |
| Boling Point | 463.44°C (rough estimate) |
| Flash Point | 242.3°C |
| Water Solubility | insoluble |
| Solubility | Solubility Insoluble in water; soluble in ethanol, methanol |
| Vapor Presure | 5.48E-14mmHg at 25°C |
| Vapor Density | 12.9 (vs air) |
| Appearance | Liquid |
| Color | Pale Red-Brown |
| Odor | Odorless |
| Maximum wavelength(λmax) | ['210nm'] |
| BRN | 3471575 |
| pKa | 8.95(at 25℃) |
| Storage Condition | Store at +5°C to +30°C. |
| Stability | Stable. Combustible. Incompatible with strong oxidizing agents. |
| Refractive Index | 1.4875 (estimate) |
1(4H)-Naphthalenone, 4-(alpha-(4-hydroxy-1-naphthyl)benzylidene)- (8CI) - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S37/39 - Wear suitable gloves and eye/face protection |
| WGK Germany | 3 |
| FLUKA BRAND F CODES | 10-21 |
| TSCA | Yes |
| HS Code | 29145000 |
1(4H)-Naphthalenone, 4-(alpha-(4-hydroxy-1-naphthyl)benzylidene)- (8CI) - Reference Information
| pH range of acid-base indicator discoloration | Green (0.0) to yellow (0.8);Yellow (8.2) to green-blue (11.0) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Use | acid-base indicator, pH8.5 (yellow) ~ 9.8 (green) acid-base titration of the indicator in the sequential injection analytical technique (pH 8.2-10.0). |
Last Update：2024-06-18 09:09:15
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View History
1(4H)-Naphthalenone, 4-(alpha-(4-hydroxy-1-naphthyl)benzylidene)- (8CI)
1-Cyclopropene-1-octanoic acid, 3-(ethoxycarbonyl)-2-octyl-, methyl ester
bismuth tris(2-oxobornane-3-carboxylate)
2-[(2-phenylethyl)sulfanyl]-1H-benzimidazole
3-tert-Butyl 2-methyl 3-azabicyclo[4.1.0]heptane-2,3-dicarboxylate
cecropin, Cecropin (antibacterial peptide)
L-METHIONINE METHYLSULFONIUM BROMIDE
2-Furancarboxamide,N-[1-[(4-chlorophenyl)sulfonyl]-4-piperidinyl]-(9CI)
2,6-DICHLOROPHENYL 3-METHYLISOXAZOLO[5,4-D]PYRIMIDIN-4-YL SULFIDE
1-Cyclopropene-1-octanoic acid, 3-(ethoxycarbonyl)-2-octyl-, methyl ester
bismuth tris(2-oxobornane-3-carboxylate)
2-[(2-phenylethyl)sulfanyl]-1H-benzimidazole
3-tert-Butyl 2-methyl 3-azabicyclo[4.1.0]heptane-2,3-dicarboxylate
cecropin, Cecropin (antibacterial peptide)
L-METHIONINE METHYLSULFONIUM BROMIDE
2-Furancarboxamide,N-[1-[(4-chlorophenyl)sulfonyl]-4-piperidinyl]-(9CI)
2,6-DICHLOROPHENYL 3-METHYLISOXAZOLO[5,4-D]PYRIMIDIN-4-YL SULFIDE