α-Naphtholbenzein

Names

[ CAS No. ]:
145-50-6

[ Name ]:
α-Naphtholbenzein

[Synonym ]:
A-NAPHTHOLBENZEIN
Alpha-Naphtholbenzein
4-(α-(4-Hydroxy-1-naphthyl)benzylidene)naphthalen-1(4H)-one
P-NAPHTHOLBENZEIN TS
(E)-4-((4-hydroxynaphthalen-1-yl)(phenyl)methylene)naphthalen-1(4H)-one
1-NAPHTHOLBENZEIN
1(4H)-Naphthalenone, 4-[(4-hydroxy-1-naphthalenyl)phenylmethylene]-, (4E)-
P-NAPTHOLBENZEIN
α-Naphtholbenzein
(4E)-4-[(4-Hydroxy-1-naphthyl)(phenyl)methylene]-1(4H)-naphthalenone
1(4H)-Naphthalenone, 4-[α-(4-hydroxy-1-naphthyl)benzylidene]-
MFCD00078492
EINECS 230-116-9

Biological Activity

[Description]:

α-Naphtholbenzein (p-Naphtolbenzein) is a dye. α-Naphtholbenzein can be used as a pH indicator. α-Naphtholbenzein has a visual transition from yellow (pH0-8.2) to turquoise (pH10). α-Naphtholbenzein is often used during sequential injection analysis technique done for acid-base titrations[1].

[Related Catalog]:

Research Areas >> Others

Signaling Pathways >> Others >> Others

[References]

[1]. Maskula S, et al. Titration of strong and weak acids by sequential injection analysis technique. Talanta. 2000 May 31;52(1):91-9.

Chemical & Physical Properties

[ Density]:
1.3±0.1 g/cm3

[ Boiling Point ]:
578.6±50.0 °C at 760 mmHg

[ Melting Point ]:
230-235 °C(lit.)

[ Molecular Formula ]:
C₂₇H₁₈O₂

[ Molecular Weight ]:
374.431

[ Flash Point ]:
242.3±22.7 °C

[ Exact Mass ]:
374.130676

[ PSA ]:
37.30000

[ LogP ]:
7.11

[ Vapour Pressure ]:
0.0±1.7 mmHg at 25°C

[ Index of Refraction ]:
1.724

[ Stability ]:
Stable. Combustible. Incompatible with strong oxidizing agents.

[ Water Solubility ]:
insoluble

MSDS

Click to get detail MSDS

Safety Information

[ Personal Protective Equipment ]:
dust mask type N95 (US);Eyeshields;Gloves

[ Hazard Codes ]:
Xi:Irritant;

[ Risk Phrases ]:
R36/37/38

[ Safety Phrases ]:
S26-S36-S37/39

[ RIDADR ]:
NONH for all modes of transport

[ WGK Germany ]:
3

[ HS Code ]:
29145000

Synthetic Route

Click to get detail synthetic route

Precursor & DownStream

Precursor

DownStream

Customs

[ HS Code ]: 2914501900

[ Summary ]:
2914501900 other ketone-phenols。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:5.5%。General tariff:30.0%

Related Compounds

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