ChemicalBook >> CAS DataBase List >>p-Naphtholbenzein
p-Naphtholbenzein
- CAS No.
- 145-50-6
- Chemical Name:
- p-Naphtholbenzein
- Synonyms
- α-Naphtholbenzein;A-NAPHTHOLBENZEIN;ALPHA-NAPHTHOLBENZEIN;1-NAPHTHOLBENZEIN Indicator grade;Nsc 9862;8.2-10.0);pha-NaphthoL;p-phtolbenzein;P-NAPTHOLBENZEIN;à-naphtholbenzein
- CBNumber:
- CB4450645
- Molecular Formula:
- C27H18O2
- Molecular Weight:
- 374.43
- MDL Number:
- MFCD00078492
- MOL File:
- 145-50-6.mol
- MSDS File:
- SDS
- TDS File:
- TDS
Last updated:2026-06-29 14:28:43
| Product description | Number | Pack Size | Price |
| α-Naphtholbenzein indicator grade | 291099 | 5g | $64.6 |
| α-Naphtholbenzein indicator grade | 291099 | 25g | $230 |
| 1-Naphtholbenzein indicator Reag. Ph Eur | 1.06202 | 5G | $71.7 |
| p-Naphtholbenzein | N0028 | 25g | $267 |
| Alpha-Naphtholbenzein (Technical Grade) | TRC-N369005-5G | 5g | $137 |
| Melting point | 230-235 °C(lit.) |
|---|---|
| Boiling point | 463.44°C (rough estimate) |
| Density | 1.0946 (rough estimate) |
| bulk density | 120-300kg/m3 |
| vapor density | 12.9 (vs air) |
| refractive index | 1.4875 (estimate) |
| storage temp. | Store at +5°C to +30°C. |
| solubility | Solubility Insoluble in water; soluble in ethanol, methanol |
| pka | 8.95(at 25℃) |
| form | Liquid |
| color | Pale Red-Brown |
| PH Range | Green (0.0) to yellow (0.8);Yellow (8.2) to green-blue (11.0) |
| Odor | Odorless |
| PH |
0.0, green 0.8, yellow 10.0, blue-green 8.2, yellow |
| Water Solubility | insoluble |
| λmax | 210nm |
| ε(extinction coefficient) | ≥50000 at 207-213nm in methanol at 0.01g/L |
| BRN | 3471575 |
| Stability | Stable. Combustible. Incompatible with strong oxidizing agents. |
| InChI | 1S/C27H18O2/c28-25-16-14-23(19-10-4-6-12-21(19)25)27(18-8-2-1-3-9-18)24-15-17-26(29)22-13-7-5-11-20(22)24/h1-17,28H/b27-24- |
| InChIKey | VDDWRTZCUJCDJM-SOYKGTTHSA-N |
| SMILES | Oc1ccc(\C(c2ccccc2)=C3\C=CC(=O)c4ccccc34)c5ccccc15 |
| CAS DataBase Reference | 145-50-6(CAS DataBase Reference) |
| EPA Substance Registry System | 1(4H)-Naphthalenone, 4-[(4-hydroxy-1-naphthalenyl)phenylmethylene]- (145-50-6) |
| UNSPSC Code | 12352115 |
| NACRES | NB.21 |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |  GHS07 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Warning | |||||||||
| Hazard statements | H315-H319-H335 | |||||||||
| Precautionary statements | P264-P280-P302+P352+P332+P313+P362+P364-P305+P351+P338+P337+P313-P261-P280a-P304+P340-P305+P351+P338-P405-P501a | |||||||||
| PPE | dust mask type N95 (US), Eyeshields, Gloves | |||||||||
| Hazard Codes | Xi | |||||||||
| Risk Statements | 36/37/38 | |||||||||
| Safety Statements | 26-36-37/39 | |||||||||
| WGK Germany | 3 | |||||||||
| F | 10-21 | |||||||||
| TSCA | TSCA listed | |||||||||
| HS Code | 29145000 | |||||||||
| Storage Class | 11 - Combustible Solids | |||||||||
| Hazard Classifications | Aquatic Chronic 4 | |||||||||
| NFPA 704 |
|
p-Naphtholbenzein price More Price(44)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich | 291099 | α-Naphtholbenzein indicator grade | 145-50-6 | 5g | $64.6 | 2026-04-30 | Buy |
| Sigma-Aldrich | 291099 | α-Naphtholbenzein indicator grade | 145-50-6 | 25g | $230 | 2026-04-30 | Buy |
| Sigma-Aldrich | 1.06202 | 1-Naphtholbenzein indicator Reag. Ph Eur | 145-50-6 | 5G | $71.7 | 2026-04-30 | Buy |
| TCI Chemical | N0028 | p-Naphtholbenzein | 145-50-6 | 25g | $267 | 2026-04-30 | Buy |
| TRC | TRC-N369005-5G | Alpha-Naphtholbenzein (Technical Grade) | 145-50-6 | 5g | $137 | 2026-06-03 | Buy |
p-Naphtholbenzein Preparation Products And Raw materials
Raw materials
Preparation Products
p-Naphtholbenzein Suppliers
Global( 265)Suppliers
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Henan Fengda Chemical Co., Ltd | +86-371-86557731 +86-13613820652 | info@fdachem.com | China | 20111 | 58 |
| Henan Tianfu Chemical Co.,Ltd. | +86-0371-55170693 +86-19937530512 | info@tianfuchem.com | China | 21533 | 55 |
| CONIER CHEM AND PHARMA LIMITED | sales@conier.com | China | 49906 | 58 | |
| career henan chemical co | +86-0371-86658258 | factory@coreychem.com | China | 29780 | 58 |
| Zhengzhou Alfa Chemical Co.,Ltd | +86-18530059196 | sale04@alfachem.cn | China | 9666 | 58 |
| Hefei TNJ Chemical Industry Co.,Ltd. | +86-0551-65418671 +86-189 4982 3763 | sales@tnjchem.com | China | 34526 | 58 |
| Dideu Industries Group Limited | +8617392712697 | 1022@dideu.com | China | 29093 | 58 |
| Dayang Chem (Hangzhou) Co.,Ltd. | +86-0571-88938639 17705817739 | info@dycnchem.com | China | 52693 | 58 |
| HANGZHOU LEAP CHEM CO., LTD. | +86-571-87711850 +8619957148339 | market18@leapchem.com | China | 24569 | 58 |
| GIHI CHEMICALS CO.,LIMITED | +86-571-86217390; +8618058761490 | info@gihichemicals.com | China | 49859 | 58 |
Related Questions
Ask a questionQ:How do you prepare a 1-naphtholbenzene indicator solution?STAR - Jun 29,2026
A:0.1~1.0 g of 1-naphtholbenzene in 100 mL of 2-propanol.
View Lastest Price from p-Naphtholbenzein manufacturers
| Image | Update time | Product | Price | Min. Order | Purity | Supply Ability | Manufacturer | |
|---|---|---|---|---|---|---|---|---|
 |
2026-08-26 | p-Naphtholbenzein
145-50-6
|
$2.00-5.00 | 1kg | 99% | Henan Fengda Chemical Co., Ltd | ||
 |
2020-02-11 | α-Naphtholbenzein
145-50-6
|
$9.80 | 1g | ＞98% | 20 tons | Career Henan Chemical Co |
-
- p-Naphtholbenzein
145-50-6
- $2.00-5.00
- 99%
- Henan Fengda Chemical Co., Ltd
-
- α-Naphtholbenzein
145-50-6
- $9.80
- ＞98%
- Career Henan Chemical Co
α-Naphtholbenzein,4,4′-(α-Hydroxybenzylidene)di-1-naphthol, p-naphtholbenzein
alpha-Naphtholbenzein, pure, 90% 10GR
alpha-Naphtholbenzein, pure, 90% 25GR
1-NAPHTHOLBENZEIN INDICATOR 5 G
α- naphthol quinone phenylMethane
MAG BIND EQUIPURE GDNA (1X96)
1-Naphtholbenzein indicator Reag. Ph Eur
1(4H)-Naphthalenone, 4-(4-hydroxy-1-naphthalenyl)phenylmethylene-
4,4'-(à-hydroxybenzylidene)di-1-naphthol
à-naphtholbenzein
1-Naphtholbenzein(PhIndicator)-(P-Naphtholbenzein)
1-Naphtholbenzein(PhIndicator)
1-NAPHTHOL BENZEIN ( ALPHA- NAPHTHOL BENZEIN) pH INDICATOR
alpha-Naphtholbenzein, pure, 90%
ɑ-Naphtholbenzein
[(4-Hydroxy-1-naphthalenyl)phenylmethylene]-1-4(H)-naphthalenone
4-[(4-Hydroxynaphthalen-1-yl)-phenylmethylidene]naphthalen-1-one
Alpha-naphtholbenzein, 90%, pure
p-Naphtholbenzein (0.2% in Acetic Acid) [for Non-aqueous titration]
p-Naphtholbenzein (1% in ca. 95% Ethanol) [for pH Determination]
alpha-Naphtholbenzein,98%
1(4h)-naphthalenone, 4-[α-(4-hydroxy-1-naphthyl)benzylidene]-
Nsc 9862
pha-NaphthoL
(4E)-4-[(4-hydroxy-1-naphthalenyl)-phenylmethylidene]-1-naphthalenone
LABOTEST-BB LT00452038
1-NAPHTHOLBENZEIN
A-NAPHTHOLBENZEIN
ALPHA,ALPHA-BIS(4-HYDROXY-1-NAPHTHYL)BENZYL ALCOHOL
4-[(4-HYDROXY-1-NAPHTHALENYL)PHENYLMETHYLENE]-1(4H)-NAPHTHALENONE
4-[(4-hydroxy-1-naphthalenyl)phenylmethylene]-1(4h)-naphthalenon
4,4’-(α-Hydroxybenzylidene)di-1-naphthol
P-NAPTHOLBENZEIN
P-NAPHTHOLBENZEIN
P-NAPHTHOLBENZEIN (ALPHA)
P-NAPHTHOLBENZEIN INDICATOR
P-NAPHTHOLBENZEIN TS
4-(alpha-(4-hydroxy-1-naphthyl)benzylidene)naphthalen-1(4H)-one
ALPHA-NAPHTHOLBENZEIN, INDICATOR GRADE
P-NAPHTHOLBENZEIN(ALPHA-)(0.2% IN ACETIC ACID)[FOR NON-AQUEOUS TITRATION]
P-NAPHTHOLBENZEIN(ALPHA-)(10% IN CA. 95% ETHANOL) [FOR PH DETERMINATION]
α - naphthol benzyl alcohol
alpha-Naphtholbenzein (Technical Grade)
α-Naphtholbenzein
p-Naphtholbenzein USP/EP/BP
α-Naphtholbenzein (Technical Grade)
α-Naphtholquinone phenylmethane 1-Naphtholbenzein, indicator Reag.
alpha-Naphthol benzene
4-(?-(4-hydroxy-1-naphthyl)benzylidene)naphthalen-1(4H)-one
P-Naphtholbenzein, Pure, Indicator Grade, Fisher Chemical&trade
8.2-10.0)
alpha-Naphtholbenzein，alpha-Naphtholbenzein
indicator (pH 0.0-0.8
p-Naphtholebnzein
(E)-4-((4-hydroxynaphthalen-1-yl)(phenyl)methylene)naphthalen-1(4H)-one
alpha-Naphtholbenzein，alpha-Naphtholbenzein，indicator (pH 0.0-0.8
indicator (pH8.2-10.0)
4-((4-Hydroxynaphthalen-1-yl)(phenyl)methylene)naphthalen-1(4H)-one
