145-50-6

145-50-6 structure

Name: α-Naphtholbenzein
Chemical Name: p-Naphtholbenzein
CAS Number: 145-50-6
Molecular Formula: C₂₇H₁₈O₂
Molecular Weight: 374.431
Catalog: Biochemical Biochemical reagent Acid-base indicator
Create Date: 2018-02-06 08:00:00
Modify Date: 2025-08-23 08:18:46
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].

Name	p-Naphtholbenzein
Synonyms	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

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.

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

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

90-15-3

98-07-7

~34%

145-50-6

Literature: Lenze; Kallmayer Pharmazie, 1995 , vol. 50, # 1 p. 36 - 38

Precursor 2
90-15-3 98-07-7
DownStream 0

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%