Naphazoline hydrochloride

Naphazoline hydrochloride Basic information
Pharmacological effects Chemical Properties Uses Production method
Product Name:Naphazoline hydrochloride
Synonyms:naphconforte;naphthasoliumchloride;niazol;2-(1-naphthalenylmethyl)-4,5-dihydro-1H-imidazole chloride;privinehydrochloride;prizolehydrochloride;rhinantin;rhinoperd
CAS:550-99-2
MF:C14H14N2.ClH
MW:246.74
EINECS:208-989-2
Product Categories:Adrenoceptor;Pharmaceutical intermediates;NORMODYNE;APIs;550-99-2
Mol File:550-99-2.mol
Naphazoline hydrochloride Structure
Naphazoline hydrochloride Chemical Properties
Melting point 254-260 °C
storage temp. Keep in dark place,Inert atmosphere,Room temperature
solubility Freely soluble in water, soluble in ethanol (96 per cent).
pkapKa (25°C) 10.35 ±0.02, (35°C) 10.13 ±0.02, (45°C) 9.92 ±0.03; pKa (25°C) 10.35 ±0.02, (35°C) 10.13 ±0.02, (45°C) 9.92 ±0.03
form Crystalline Powder
color White
PHpH (50g/l, 25℃) : 4.0~6.0
Water Solubility 170 g/L (20 ºC)
Sensitive Hygroscopic
Merck 14,6368
BRN 3716843
Stability:Hygroscopic
InChIKeyDJDFFEBSKJCGHC-UHFFFAOYSA-N
CAS DataBase Reference550-99-2(CAS DataBase Reference)
Safety Information
Hazard Codes T,Xn
Risk Statements 25-23/24/25-20/21/22
Safety Statements 45-36/37/39-24/25
RIDADR UN 2811 6.1/PG 2
WGK Germany 3
RTECS NJ4375000
HazardClass 6.1
PackingGroup III
HS Code 29339900
Hazardous Substances Data550-99-2(Hazardous Substances Data)
ToxicityLD50 s.c. in rats: 385 mg/kg (Gylfe)
MSDS Information
ProviderLanguage
2-(1-Naphthylmethyl)imidazoline hydrochloride English
ACROS English
SigmaAldrich English
ALFA English
Naphazoline hydrochloride Usage And Synthesis
Pharmacological effectsNaphazoline hydrochloride, is commonly used as a vasoconstrictor in the hospital's otorhinolaryngology and ophthalmology ,it is a adrenomimetic drug ,it has a strong effect on contraction of blood vessels and blood pressure elevation,it has inhibition effect on the central nervous system,by contraction of local vascular, it can play an anti-inflammatory and analgesic role in the local inflammatory lesions , and can eliminate congestion due to fatigue or other reasons. Clinically it is used for the treatment of colds, acute and chronic rhinitis, allergic conjunctivitis, allergic and inflammatory nasal congestion embolism. Local long-term use can lead to blood flow reduction in medication area, which causes resistance decreasing , and results in superinfection. It can not be taken orally. Dropping excess liquid or high concentrations can cause poisoning. Care should be taken, especially in children. Infants, hypertension, hyperthyroidism patients should take with caution, atrophic rhinitis patients are banned. The interval time of dropping , is preferably not less than 4 to 6 hours.
The above information is edited by the chemicalbook of Tian Ye.
Chemical PropertiesWhite crystalline powder. Melting point 255-260 ℃. 40 grams of the product can be dissolved in 100 ml of water . It is soluble in alcohol, slightly soluble in chloroform, insoluble in ether and benzene. Odorless, bitter taste.
UsesThis product is a vasoconstrictor. Rat subcutaneous injection is LD50 385 mg/kg.
Production methodBy the α-naphthalene acetic acid and ethylene diamine condensation, cyclization ,2-(1-naphthylmethyl) imidazoline (C14H14N2, [835-31-4]) is made , then after salifying, naphazoline hydrochloride is derived . The α-acetic acid and ethylene diamine are added to the reaction pot, stir and heat to 120 ℃, react after 1 hour, then heat to 130 ℃, react for 1 hour. Ethylenediamine and water are distilled ,and after vacuum distillation, collect 180-240 ℃ (1.33-4 kPa) distillate, obtain 2-(1-naphthylmethyl) imidazoline. It is dissolved in a mixture of acetone and ethanol, and at 10-12℃ inlet hydrogen chloride gas to become into a salt, naphazoline hydrochloride crystals is generated .
Chemical PropertiesWhite or almost white, crystalline powder.
OriginatorAlbalon,Allergan,Australia
UsesNaphazoline Hydrochloride is a useful synthetic intermediate used in eye drops. A vasoconstrictor.
Usesadrenergic blocker
Usesantihistamine
DefinitionChEBI: Naphazoline is an organic molecular entity.
Manufacturing Process2.7 parts of naphtyl-(1)-acetiminoethylether (produced from naphthyl-1- acetonitrile) were dissolved in 12 parts of absolute alcohol. 1 part of ethylenediamine is then added and the mixture was heated to gentle boiling while passing it through nitrogen and simultaneously stirring until ammonia escaped no longer. The alcohol was is then distilled and the residue mixed with 40 parts of benzene and 1.8 parts of caustic potash. Stirring was continued for some time whereby the imidazoline base was dissolved in benzene. The benzene residue, is recrystallized several times from toluene. The 2-[naphthyl-1-methyl]-imidazoline represented the coloriless crystalls of melting point 252°-253°C. Its hydrochloride is easily soluble in water.
Brand nameAlbalon (Allergan); Nafazair (Bausch & Lomb); Nafazair (Pharmafair); Naphcon (Alcon); Opcon (Bausch & Lomb); Vasocon (Novartis).
Therapeutic FunctionVasoconstrictor, Nasal decongestant
Naphazoline hydrochloride Preparation Products And Raw materials
Raw materials1-Methylimidazole-->Imidazolidine-->1-Naphthaleneacetic acid-->Ethylenediamine
NAPHAZOLINE HYDROCHLORIDE - REFERENCE SPECTRUM NAPHAZOLINE HYDROCHLORIDE EPN(CRM STANDARD) Naphazoline hydrochloride Naphazoline NAPHAZOLINE HYDROCHLORIDE REFERENCE SPECTRUM EPY(CRM STANDARD) NAPHAZOLINE HYDROCHLORIDE NASAL DROPS Imidazoline inhibitor Topotecan hydrochloride NAPHAZOLINE HYDROCHLORIDE IMP. C (EP): (1-NAPHTHYL)ACETONITRILE MM(CRM STANDARD) Naphazoline nitrate NAPHAZOLINE HYDROCHLORIDE MM(CRM STANDARD) NAPHAZOLINE HYDROCHLORIDE IMP. C (EP):(NAPHTHALEN-1-YL)ACETONITRILE (1-NAPHTHYLACETONITRILE) Imidazolidine 1-AdaMantanethylaMine Oxymetazoline hydrochloride Clonazoline 4-Imidazolemethanol hydrochloride NAPHAZOLINE HYDROCHLORIDE IMP. A (EP) AS HYDROCHLORIDE: (1-NAPHTHYL)ACETYLETHYLENDIAMINE HYDROCHLORIDE MM(CRM STANDARD)

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